Hcip VC [PDF]

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1. In H.323 protocol, opening the logical channel follows the rule of "who want to transmit, who open it". () TRUE FALSE 2. For FEC, When both parties establish a call and the packet loss in media stream exceeds 0.1% within 10s, the FEC function is enabled. FEC separates some bandwidth from the call bandwidth to transmit anti-dropping redundant stream. ( ) TRUE FALSE 3. In Multi-channel Cascading, the prioritie at using the multiple channels is (). they are the same Upper-level MCU > Lower-level MCU Upper-level MCU < Lower-level MCU user can define it 4. The methods for scheduling a conference that supports recording include (). (Select 3 answers) Using the video phone Using the SMC Using the video terminal web interface Using the telepresence system touch panel 5. Wireshark supports packet decoding for various protocols, include (). (Select 3 answers) IP TCP RTP 263 6. Over an H.460 network, private video terminals connect to () in the SETUP phase, TSs GKs Public network terminals MCUs 7. A Network Diagnostician remotely instructs another Network Diagnostician to initiate a diagnostic test to a network diagnostician in another network. ( ) TRUE FALSE

8. In Multi-channel Cascading, the protocols of all multi-channel conference sites must be consistent, but band widths can be different. ( ) TRUE FALSE 9. An MCU belongs to one service areas. A service area can have multiple MCUs. ( ) TRUE FALSE 10. If two MCUs are cascaded to hold a conference, the MCUs join the conference as virtual sites. () TRUE FALSE 11. Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. () TRUE FALSE 12. Multicast allows one or multiple senders (multicast sources) to send one data packet to multiple receivers at a time. ( ) TRUE FALSE 13. MCUs assigned to the same service area must share a prefix. () TRUE FALSE 14. The six call steps of H.323 apply to all H.323 terminals. () TRUE FALSE 15. In Videoconferencing room the reason Why the illuminance cannot be too low is because the camera generates significant white noises under low illuminance using CCD or CMOS. ( ) TRUE FALSE 16. The NLog is part of SMC, Huawei’s conference management software. () TRUE FALSE 17. A video terminal on a private network (video terminal A) uses the IP address 10.1.0.10, the static NAT outbound address is 61.1.0.10, and the GK IP address is 61.1.0.11. A video terminal

on a public network (video terminal B) uses the IP address 61.1.0.12. Video terminal B can dial ( ) to call video terminal A. 10.1.0.10 61.1.0.10 61.1.0.11 61.1.0.12 18. Users can dial the MCU IP address and follow the IVR instructions to create a conference. () TRUE FALSE 19. For INVITE transaction, messages are retransmitted at intervals of () by default. 500ms, 1s, 2s, 4s, 4s, 4s 500ms, 1s, 2s, 4s, 8s, 16s 500ms, 1s, 2s, 4s, 8s, 8s 500ms, 1s, 2s, 4s, 16s, 16s 20. The To tag, From tag, and Call-ID define the SIP relationship between the user agent client (UAC) and user agent server (UAS), which refers to a dialog. () TRUE FALSE 21. SIP and H.323 video terminals can send and receive T.140 captions. () TRUE FALSE 22. The omnidirectional collect tone suites a big-sized conference room. The omnidirectional collect tone suites a small-sized conference room. ( ) TRUE FALSE 23. () methods are available for sites to join an IVR conference. 1 2 3 4 24. For Rack MCU, we can configure two main control boards for redundancy backup. On the SMC' you just need to configure one IP address for the active and standby main control boards. () TRUE

FALSE 25. In RTCP packet, Sender report (SR) used for transmission and reception statistics from sending gateways. ( ) TRUE FALSE 26. The advantages of AAC-LD are: low bandwidth; short delay; high voice quality. ( ) TRUE FALSE 27. Which of the following statements about HD video terminals is correct. () HD video terminals cannot communicate with SD video terminals. The HD video terminal must register with the GK for communication. The HD video terminal support Far-End Camera Control. The HD video terminal web login user name cannot be left blank. 28. The Fault Diagnosis Methods of huawei videoconferencing system are: Paving the way, Tracking clues, Incremental analysis, Bold but cautious, Passing down experience. ( ) TRUE FALSE 29. MCU Video Firewall Mode has advantages, but it also has limitation, such as (). (Select 3 answers) The MCU supports communication between only two networks. The communication among more than two networks, however, is not supported. The GE0 port must register with a G The GE1 port is used only for calls by number The endpoint at the GE1 side does not support the SiteCall service. Sites connected through GE1 ports does not support service switchovers. 30. The recoded files can be downloaded and played locally in () format. .FLV .WMV .RMVB .MTV 31. Originally, MCU cascading involves one cascaded channel, which can transmit one channel of video stream. In a telepresence conference, the channel can transmit only the video for the pane in the center. After multi-channel cascading is supported, each level of MCU can transmit

multiple channels of video streams and therefore can transmit all three panes in a telepresence conference, to improve user experience. () TRUE FALSE 32. MSDA is Master Slave Determination Acknowledge (The carried Master or Slave flag refers to the status of the local endpoint.) ( ) TRUE FALSE 33. By establishing multiple cascaded channels between cascaded conferences of MCUs, you can send multiple channels of streams from the local MCU to the remote MCU. () TRUE FALSE 34. Video loopback is used to check whether the local video input and output are normal. () TRUE FALSE 35. One conference allows for up to () groups of continuous presence. 1 12 24 96 36. Via, From, To, Call-ID, Cseq, the previous five header fields must be contained in every SIP message. () TRUE FALSE 37. NAT works at the (). Data link layer Network layer Application layer Transport layer 38. Current video communication mainly uses the 4:2:0 sampling. ( ) TRUE FALSE 39. The recording request from a video terminalis sent to the MCU and the MCU controls the recording. () TRUE FALSE

40. In the stretch mode, the aspect ratio of the input video is adjusted to fit the video for the monitor. The video will be cut. ( ) TRUE FALSE 41. A Network Diagnostician in a public network initiates a diagnostic test to a Network Diagnostician in a private network. ( ) TRUE FALSE 42. The three frame types in H.264 are (). A, Q, P B, I, P C, Q, B T, C, B 43. Over an H.460 network, communication between the video terminal and client GK complies with (). 460 323 460.18/19 931 44. RFC2190 defines three formats for H.263 payload header: modes A, B, and C. Mode A is recommended and also the most common one. () TRUE FALSE 45. Audio Enhancement Technologie-Jitter Buffer, use a human intervention signal wave to remove echo signals while retaining normal audio signals to improve the voice quality of a telephone call. () TRUE FALSE 46. T.140 Caption can be sent or received by only endpoints that support T.140 captions. () TRUE FALSE 47. Audio signals can be encoded in the following modes. () (Select 3 answers) Waveform coding Forecast coding

Parameter coding Hybrid coding 48. Which of the following is not a disadvantage of forward error correction. () Occupation of more bandwidth Deterioration of video quality Delay Aggravation of video jitter 49. After you define the open logical channel on a private network terminal inside a firewall, if (), the media streams can be transmitted in one direction only. The firewall does not have the relevant port enabled. The private IP address cannot be found for media stream transmission. The master and slave relationship cannot be determined. Capability negotiation cannot be implemented. 50. The RRQ message carrying registration information including the () registers on the GK. (Select 3 answers) IP address MAC address 323 ID Port 51. Video firewall mode requires the MCU to support other suppliers’ proprietary protocols to allow network access from endpoints of other suppliers. () TRUE FALSE 52. During the process for setting up H.323 calls, the MCU is responsible for recording the registration addresses of terminals. () TRUE FALSE 53. The MP can provide the following functions. () (Select 2 answers) Stream forwarding Call Rate adaptation Conference control 54. Video compression standards that are widely used currently include the H.261, H.263, and H.264 of the ITU and MPEG-1, MPEG-2, and MPEG-4 of the ISO/IEC. The H.26x series standards are used in real-time video communication. The MPEG series standards are used in video storage (on DVDs), video broadcast, and video streaming media. ()

TRUE FALSE 55. RFC 3550 defines () RTCP packet types to carry a variety of control information. 3 4 5 6 56. Audio mixing is to mix the several sites with the largest sounds, except for the local site, not to mix the sounds of all sites. () TRUE FALSE 57. In video conferencing system, we have two way to prevent packet loss, one is FEC, the other is ARQ. () TRUE FALSE 58. Color temperature is a measure of the quality of optical source and spectrum. The unit of the color temperature is lux (lx). () TRUE FALSE 59. The NLog enables users to save collected network statistics in formats excluding (). .JPG .PNG .CSV .TXT 60. The LAN2 port of terminals is used to (). Implement main services. Log in to the video terminal to capture packets. Take over the service on the LAN1 port if the LAN1 port fails to work. Share loads with the LAN1 port. 61. Video compression includes intraframe compression (I-frame) and interframe compression (P-frame). H.26x, MPEG-2, and MPEG-4 support intraframe or interframe compression. ( ) TRUE FALSE 62 Users can dial a conference ID and follow the IVR instructions to create a video conference. A. TRUE B. FALSE

1. (True or False）Wireshark can process data and monitor the network status.( )  A. True B. False 2. (Multiple choice, select 3 Answers）The GK provides the following functions.( ) A. Address translation B. Access authentication C. Bandwidth control D. Conference control   3. (True or False）H.225 used for medial channel control including call signaling (Q.931) and RAS communication between endpoints and the GK.(  ) A. True B. False 4. (Single choice）In H.323 protocol, the last number 3 means.(  ) A. B-ISDN B. QOS C. PNN D. GSTN and radio network 5. (Single choice）In normal situation, which part is not contained in the "endpoint"(  ). A. Terminal B. MCU C. Gateway D. GK 6. (Single choice） RAS is carried at the UDP layer and this port number can be configured on the MCU，the default value of source port is(  ). A. 1729 B. 1719 C. 1720 D. 1725 7. (True or False）ARQ carries information about the MCU including the IP address and port number and number about the endpoint to be called. (  ) A. True B. False 8. (Single choice） In the H.323 protocol stack, dual stream is addressed by(  ). A. H.261 B. H.245 C. 1720 D. H.239 9. (Single choice）（ ） is used for conference control. A. H.245 B. H.225

C. H.239 D. H.281 10. (Multiple choice, select 2 Answers）H.225 defines （ ）signaling. A. Q.931 B. H.281 C. RAS D. T.120   11. (True or False）During the process to set up a point-to-point call, a GK receives two call requests(  ). A. True B. False   12. (True or False）The session description protocol (SDP) is a transmission layer protocol that defines multimedia sessions(  ). A. True B. False   13. (True or False）The SIP is a protocol that independently developed at the application layer and can be carried over different transport layer protocols, for example the UDP, TCP, TLS, and SCTP (among which the TCP is widely used).(  ) A. True B. False   14. (True or False）RTP:used for Real-time data packets transmission; RTCP: used for Monitoring of RTP session quality of service (QoS).(  ) A. True B. False   15. (True or False）PCM mainly includes sampling, quantization, and encoding.(  ) A. True B. False   16. (Multiple choice, select 3 Answers）In video conferences, in order to improve the voice quality, we can use Audio Enhancement Technologies such as(  ). A. VAD B. CNG C. AAC-LD D. EC   17. (Multiple choice, select 3 Answers） Which protoclos are used for Data Encapsulation and Transmission(  ). A. RTP B. RSVP C. RTSP D. SIP  

18. (Multiple choice, select 3 Answers）Acoustic elements contain:(  ) A. Timbre B. pitch C. loudness D. volume   19. (Multiple choice, select 2 Answers）The（ ）differ human voices from each other. A. Timbre B. pitch C. loudness D. volume   20. (Single choice）In the Videoconferencing System, the requirment for the local noise must be lower than or equal to(  ). A.36dB. B.38dB. C.40dB. D.34dB. 21. (Single choice）Dynamic Dual Streams, Complies with the（ ）standard. A. H.320 B. H.323 C. H.245 D. H.239   22. (Single choice）Dynamic Dual Streams,supports concurrent transmission of（ ） independent images. A. 2 B. 3 C. 4 D. 5 23. (True or False）Presentation can be video or a computer desktop.(  ) A. True B. False 24. (Multiple choice, select 3 Answers）The HD endpoints support point-to-point calls based on(  ): A. phone numbers B. site names C. MAC address D. IP address 25. (Multiple choice, select 3 Answers）The HD endpoints support 16:9 output in(  ). A. 1080P B. 720I C. 1080I D. 720P

26. (True or False）Only when the remote sites support T.140, banners, captions, or instant messages can be sent to one specific site in T.140 mode.(  ) A. True B. False 27. (True or False）The CP function allows displaying the video of two or more sites on the same output device at the same time. The number of the sites to be displayed and the layout of the site videos vary according to CP modes. A. True B. False 28. (True or False） T.140 Caption will be overlaid on the video of the local site, sent to remote sites, and displayed on remote monitors.(  ) A. True B. False 29. (True or False）If the video format set to Smooth, the system ensures the specified video resolution first.(  ) A. True B. False 30. (True or False） For cascading between MiniMCUs, in the case of default calling, the calling party will be the main MiniMCU and will stay as the main MiniMCU during the conference(  ). A. True B. False   31. (True or False）For Remote audio loopback, The test process includes audio input, coding, transmission, and loopback from the remote end and aims to check whether the network connection is normal.(  ) A. True B. False   32. (Single choice） The LAN2 port of terminals is used to(  ). A. Implement main services B. Log in to the video terminal to capture packets C. Take over the service on the LAN1 port if the LAN1 port fails to work D. Share loads with the LAN1 port   33. (Single choice）The upgrade software format of the HD video terminal is(  ) A. txt B. dat C. tkn D. tp4   34. (Single choice）The video terminal uses the（ ） to read camera data. A. Video cable B. Audio cable

C. Control cable D. Infrared cable   35. (Multiple choice, select 3 Answers）The three HD display modes provided by the HD video terminal are(  ). A. Stretch B. No stretch C. Tile D. Intelligent stretch   36. (True or False）If you forget the user name and password to log in to the HD video terminal web interface, the only thing you can do is to restore the video terminal to its default settings.(  ) A. True B. False   37. (True or False） One continuous presence conference occupies the coding resources of one channel of continuous presence on the MCU. Each pane occupies the decoding resources for half channel of continuous presence.(  ) A. True B. False   38. (Multiple choice, select 3 Answers）If the（ ）at the transmit end and receive end are consistent, the MCU can directly forward the video stream. A. video protocols B. formats C. video type D. bandwidths   39. (True or False） In any view mode, a site can view the video of any other sites.(  ) A.True B.False 40. (True or False） The video firewall mode is a simple method used for traversal between private and public networks. Different network interfaces of the MCU are connected to different networks so that endpoints on different networks can participate in the same conference.(  ) A. True b. False   41. (Single choice） In video firewall mode, the（ ） must register with a GK. A. GE1 port B. GE1 or GE0 port C. FE port D. GE0 port   42. (Single choice）Which of the following cannot be exported from the device management page of the MCU web interface?(  ) A. Address book B. License

C. Gateway/MCU D. Status table   43. (Single choice）The default working mode of the MCU GE1 port is(  ). A. Video firewall B. Packet capture C. Backup D. Dynamic switching   44. (True or False）The FE port IP address cannot be in the same network segment as the GE0 or GE1 port IP address. Otherwise, network faults may occur, and the ALM indicator on the front panel is on.(  ) A. True B. False   45. (Single choice）Which of the following users has the highest level of permissions?(  ) A. Conference administrator B. Conference operator C. Systemadministrator D. System debug user   46. (Single choice）（ ）methods are available for sites to join an IVR conference. A. 1 B. 2 C. 3 D. 4   47. (Single choice）The default IVR access number for joining a conference is(  ). A. 168 B. 5000 C. 8000 D. 9000   48. (True or False）IVR provides an interactive method for joining or creating a conference.(  ) A. True B. False   49. (Single choice） In Multi-channel Cascading, the prioritie at using the multiple channels is(  ). A. they are the same B. Upper-level MCU > Lower-level MCU C. Upper-level MCU < Lower-level MCU D. user can define it   50. (Single choice）The NLog V2 obtains statistics from the(  ). A.SMC. B.GK. C.Video terminal.

D.MCU. 51. (Single choice）The NLog enables users to save collected network statistics in formats excluding(  ). A. JPG B. PNG C. CSV D. TXT   52. (Multiple choice, select 2 Answers） For the following technologies used for traversal between public and private networks, no additional network device is required(  ): A. H.460 B. ALG C. Static NAT D. SNP 53. (True or False）After the NAT is enabled on terminals, the packets sent by the terminals can be changed with static NAT, DNAT, or NATP.(  ) A. True B. False 54. (Multiple choice, select 2 Answers） The IP header in an ACF message does not contain the following:(  ) A. Caller RAS addr B. Callee Number C. GK RAS addr D. Callee CS addr 55. (Multiple choice, select 2 Answers） If a public network terminal fails to call a private network terminal in videoconferencing service, what technologies can be used to modify private network packets to address this issue?(  ) A. Static NAT B. SNP C. ALG D. H.460 56. (True or False） In essence, NAT is to change the headers (source address) in packets to NAT addresses.(  ) A. True B. False 57. (Multiple choice, select 3 Answers）Video streams sent from the MCU to the recording server can be（ ）on the server. A. Live broadcast B. Played on demand C. Uploaded D. Downloaded

58. (True or False） A Network Diagnostician remotely instructs another Network Diagnostician to initiate a diagnostic test to a network diagnostician in another network.(  ) A. True B. False 59. (True or False） The recording request from a video terminalis sent to the MCU and the MCU controls the recording.(  ) A. True B. False 60. (Single choice）The recoded files can be downloaded and played locally in （ ） format. A. FLV B. WMV C. RMVB D. MTV 61 Loudness is an auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud. Loudness may be quantified by the amplitude of sound waves. ( ) A. TRUE B. FALSE QUESTION 2 In the stretch mode, the aspect ratio of the input video is adjusted to fit the video for the monitor. The video will be cut. ( ) A. TRUE B. FALSE QUESTION 3 Conferences are not interrupted during the failover between active and standby MCUs.0 A. TRUE B. FALSE QUESTION 4 The MCU needs to decode videos of all endpoints involved in the continuous presence, code the video into one channel of video, and transmit the video to all endpoints that need to view the continuous presence.( ) A. TRUE B. FALSE QUESTION 5 After you define the open logical channel on a private network terminal inside a firewall, if ( ), the media streams can be transmitted in one direction only. A. The firewall does not have the relevant port enabled. B. The private IP address cannot be found for media stream transmission. C. The master and slave relationship cannot be determined. D. Capability negotiation cannot be implemented. QUESTION 6 A transaction only can be identified by a unique branch.( ) A. TRUE B. FALSE

QUESTION 7 Image format refers to image size or resolution. Common image formats contain: SQCIF, QCIF, CIF, 4CIF, 16CIF, HD, Full HD.( ) A. TRUE B. FALSE QUESTION 8 Which message is used for Endpoint registration.( ) A. RCF B. ACF C. LCF D. INAK QUESTION 9 In Multi-channel Cascading, the prioritie at using the multiple channels is ( ). A. they are the same B. Upper-level MCU > Lower-level MCU C. Upper-level MCU D. user can define it Correct Answer: B QUESTION 10 Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. ( ) A. TRUE B. FALSE QUESTION 11 Wireshark captures packets over various interfaces, except WLAN ports. ( ) A. TRUE B. FALSE QUESTION 12 ( ) is added into the SIP in June, 2002, which is the core standard of the SIP. A. RFC3263 B. RFC3262 C. RFC3261 D. RFC3264 QUESTION 1 The system with SEC enabled automatically adjusts error correction strategies for network transmission and video and audio processing using rich QoS modes of IP networks. The packet loss concealment capacity improves more than 60% compared with the industrial level. ( ) A. TRUE B. FALSE QUESTION 2 Acoustic echoes are local sounds that are returned from the peer end. In this case, ensure that the speaker sound cannot be returned through the microphone. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 3 An H.323 terminal is a node on the network and performs real-time bidirectional communication with other H.323 terminals, the gateway, or the MCU.( ) A. TRUE B. FALSE Correct Answer: A QUESTION 4 For Remote audio bopback, The test process includes audio input, coding, transmission, loopback from the remote end and aims to check whether the network connection is normal. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 5 Which of the following statements are true about the client proxy in H.460? ( ) (Select 3 answers) A. The client proxy is compliant with H.460. B. The client proxy is compliant with H.323.

C. The client proxy includes the client GK, H.460.18 client, and H.460.19 client. D. The client proxy use H.323 to communicate with terminals. QUESTION 1 If the video format set to Smooth, the system ensures the specified video resolution first. ( ) A. TRUE B. FALSE Correct Answer: B QUESTION 2 For Remote audio bopback, The test process includes audio input, coding, transmission, loopback from the remote end and aims to check whether the network connection is normal. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 3 The RRQ message carrying registration information including the( )registers on the GK. (Select 3 answers) A. IP address B. MAC address C. H.323ID D. Port Correct Answer: ACD QUESTION 4 Dynamic Dual Streams,supports concurrent transmission of ( ) independent images. A. 2 B. 3 C. 4 D. 5 QUESTION 5 In the following descriptions, which are belong to audio mixing policies. ( ) (Select 3 answers) A. Audio mixing is performed for the several channels with large sound, to prevent noise. B. Audio mixing is performed for the several channels with small sound, to prevent noise. C. The sound can be prevented from sending to an endpoint D. You can configure the system not to process sound from one endpoint Correct Answer: ACD QUESTION 1 Video loopback is used to check whether the local video input and output are normal.( ) A. TRUE B. FALSE Correct Answer: A QUESTION 2 After the NAT is enabled on terminals, the packets sent by the terminals can be changed with static NAT, DNAT, or NATP.( ) A. TRUE B. FALSE Correct Answer: B QUESTION 3 For Rack MCU, we can configure two main control boards for redundancy backup. On the SMC, you just need to configure one IP address for the active and standby main control boards. ( ) A. TRUE B. FALSE Correct Answer: B

QUESTION 4 The CP function allows displaying the video of two or more sites on the same output device at the same time. The number of the sites to be displayed and the layout of the site videos vary according to CP modes. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 5 Dynamic NAT allows the mapping of multiple internal IP addresses to one public IP address a the mapping of multiple internal IP addresses to multiple public IP addresses.( ) A. TRUE B. FALSE Correct Answer: A QUESTION 1 The audio test on the video terminal checks whether the audio output of the video terminal is correct. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 2 The advantages and disdvantages of Forward error correction (FEC) are( ). (Select 2 answers) A. it has high requirements for latency, which makes it difficult to use in live networks, it is effective only in slight packet loss. In addition, it results in more video jitter B. it occupies little bandwidth and slightly impacts the video quality C. The video quality is affected because the redundant data occupies some bandwidth. In addition, it cannot handle burst packet loss, and a certain delay is introduced D. it can restore the lost data with a certain probability and it is applicable to common packet loss scenarios Correct Answer: CD QUESTION 3 Video signals are input into the terminal and transmitted over the network after encoding, compression, displaying, and many other image processing operations, such as: IPC, Preprocessing, Compression coding, Data encapsulation and transmission, Decoding, Image format conversion, Playing. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 4 Originally, MCU cascading involves one cascaded channel, which can transmit one channel of video stream. In a telepresence conference, the channel can transmit only the video for the pane in the center.After multi-channel cascading is supported, each level of MCU can transmit multiple channels of video streams and therefore can transmit all three panes in a telepresence conference, to improve user experience.( ) A. TRUE B. FALSE Correct Answer: A QUESTION 5 Which message indicates that the request can not be fulfiied at any server. ( ) A. 1xx B. 3xx C. 5xx D. 6xx Correct Answer: D QUESTION 1 Response Messages "4xx" Indicate that the request message contains syntax errors or the SIP server cannot process the request message. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 2 Functions of RTP in voice over IP are as follows: Real-time transmission of media data; Jitter cancellation, Packet ordering, Packet loss prevention, Transmission of DTMP signal, signal tones, and signaling in some situations. ( )

A. TRUE B. FALSE Correct Answer: A QUESTION 3 An RTP packet consists of the fixed RTP header and the payload data, the first 12 bytes of the header are fixed and have fixed meaning. The payload can be audio or video data; ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 4 The recording request from a video terminals sent to the MCU and the MCU controls the record ing.( ) A. TRUE B. FALSE Correct Answer: B QUESTION 1 Response Messages "4xx" Indicate that the request message contains syntax errors or the SIP server cannot process the request message. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 2 Functions of RTP in voice over IP are as follows: Real-time transmission of media data; Jitter cancellation, Packet ordering, Packet loss prevention, Transmission of DTMP signal, signal tones, and signaling in some situations. ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 3 An RTP packet consists of the fixed RTP header and the payload data, the first 12 bytes of the header are fixed and have fixed meaning. The payload can be audio or video data; ( ) A. TRUE B. FALSE Correct Answer: A QUESTION 4 The recording request from a video terminals sent to the MCU and the MCU controls the record ing.( ) A. TRUE B. FALSE Correct Answer: B The network device connected to an MCU network port must be 100 Mbit/s half-duplex.() A. FALSE B. TRUE Answer: A. The address book file exported from the MCU web interface is in()format. A. .DAT B. .VCF C. .CAP D. .XML Answer: B. Question #2 Different from traditional video conferences, ad hoc conferences can be created and joined from video terminals, without the assistance from administrators.() A TRUE B FALSE Question #3 For Reverberation, The collect tone mainly uses direct sounds. An appropriate amount of reverberation makes human voice more vigorous. Therefore, a proportion of 90% direct sounds in the collect tone is recommended. However, the reverberation after 50 ms makes listeners difficult to understand. It is good practice that the sound energy reaches over 80% after 50 ms. ( )

TRUE FALSE Question #4 When the MCU is in video firewall mode, the original firewall settings (for example, ports that are enabled) must be changed.() TRUE FALSE Question #5 After NAT is enabled on the video terminal, packet transmission between public and private networks can be implemented in ( ) networking mode. A Static NAT networking B DNAT C NAPT D All of the above If ALM indicator of the MCU is on, and a message is displayed to indicate insufficient license resources when you schedule a conference, the possible cause is that the MCU license does not match the MCU hardware.() A TRUE B FALSE Different from traditional video conferences, ad hoc conferences can be created and joined from video terminals, without the assistance from administrators.() A TRUE B FALSE For Reverberation, The collect tone mainly uses direct sounds. An appropriate amount of reverberation makes human voice more vigorous. Therefore, a proportion of 90% direct sounds in the collect tone is recommended. However, the reverberation after 50 ms makes listeners difficult to understand. It is good practice that the sound energy reaches over 80% after 50 ms. ( )

A TRUE B FALSE For Ad Hoc conference, users can create and join an ad hoc conference conveniently from terminals by following video and audio instructions. ( ) A TRUE B FALSE For SDP,the o line contains parameters related to the session participants. The first parameter indicates (). A the calling party name B the session identifier of the calling party C the network type D the address type For Response Messages, 3XX meansOA Indicates that the request is received and under processing B Indicates that the response is received and successfully processes. C Indicates that further operations are required to complete this request. D Indicates that the server is faulty and consequently cannot process correct messages. Which message indicates that the server is faulty and consequently cannot process correct messages. ( ) A 1xx B 3xx C 5xx D 6xx 1080i 50/60 fps: Interlaced scan for images, 50 or 60 fields per second.( )

A TRUE B FALSE The GK must support BRQ, BCF, and BRJ messages and accept all requests for changing bandwidth. ( ) A TRUE B FALSE White balance changes the overall mixture of colors in an image by using camera electrics to balance the color differences, and thereby getting colors appear correct or pleasing. ( ) A TRUE B FALSE NAT is used to translate addresses between the private network and public network.() A TRUE B FALSE he video firewall mode does not require additional network devices for public/private traversal.() A TRUE B FALSE Call abnormalities occur when non-compatible firewalls start the H.323 ALGs. () A TRUE B FALSE The SIP works on the basis of messages which are the base units for the interaction between the SIP client and server(). A TRUE B FALSE

The FE port IP address cannot be in the same network segment as the GEO or GE1 port IP address. Otherwise, network faults may occur, and the ALM indicator on the front panel is on. () A TRUE B FALSE Multichannel audio mixing uses quick voice detection so that background noises can be entirely cut. The traditional simple multichannel audio mixing will not introduce enormous background noises. ( ) A TRUE B FALSE For Network-based Recording, no MCU resource is used and the running status of the video conference is not affected. () A TRUE B FALSE Dynamic NAT allows the mapping of multiple internal IP addresses to one public IP address a the mapping of multiple internal IP addresses to multiple public IP addresses.() A TRUE B FALSE Area management is implemented by ( ). A GK B SMC C MCU D HD video terminal The default working mode of the MCU GE1 port is ( ). A Video firewall B Packet capture

C Backup D Dynamic switching A sound test on the video endpoint checks whether the audio output is normal. ( ) A TRUE B FALSE ( ) signaling is used for master/slave determination. A GRQ,GCF B DRQ, DCF C TCSR,TCSA D MSDR, MSDA The HD endpointssupport the ITU-T G.711, G.722, G.728, AAC-LD (mono-or binaural-audio channel), and HWA-LD audio protocols, showing a strong audio compatibility() A TRUE B FALSE Multicast allows one or multiple senders (multicast sources) to send one data packet to multiple receivers at a time. ( ) A TRUE B FALSE In Videoconferencing room the reason Why the illuminance cannot be too low is because camera generates significant white noises under low illuminance using CCD or CMOS. ( ) A TRUE B FALSE MCUs assigned to the same service area must share a prefix. ()

A TRUE B FALSE Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. () A TRUE B FALSE The IP header in a SETUP message does not contain the following ( ). (Select 2 answers) A Caller CS address B GK RAS address C Caller RAS address D Callee CS address VP 9000 products support CP: A maximum of () CP groups are supperted in one conference. 24 On the endpoint web interface, we can set 12 parameters related to captions.T.140 captions include banners, middle caption, and instant messages. Banners and middle broadcasted, or sent to specified sites ???????? When the protocol and format have been specified on the endpoint, the sharp and smooth policy becomes invalid. A. FALSE B. TRUE We can choose "Diagnostics > System Information > Specificaions" to query the specifications about audio, video, interface, and bandwidth. A. FALSE B. TRUE Bandwidth restriction on specified network segments will result in terminals' GK registration failures.(). ATRUE. BFALSE.  Of the messages between GKs, a/an ( ) message is sent by the called terminal to the calling terminal to indicate that the called terminal is off-hook.

A alerting B proceeding C setup D connect Bandwidth restriction on specified network segments will result in terminals' GK registration failures.() A TRUE B FALSE An H.323 terminal is a node on the network and performs real-time bidirectional communication with other H.323 terminals, the gateway, or the MCU.() A TRUE B FALSE The MCU supports ( ) concurrent web users. A1 B2 C3 D More than three SEC2.0 is used for burst packet loss. () A TRUE B FALSE Question: 1 In H.323 protocol, opening the logical channel follows the rule of "who want to transmit, who open it". () A. TRUE B. FALSE Answer: A Question: 2 For FEC, When both parties establish a call and the packet loss in media stream exceeds 0.1% within 10s, the FEC function is enabled. FEC separates some bandwidth from the call bandwidth to transmit antidropping redundant stream. ( ) A. TRUE B. FALSE Answer: A In Multi-channel Cascading, the prioritie at using the multiple channels is ( ). A. they are the same

B. Upper-level MCU > Lower-level MCU C. Upper-level MCU < Lower-level MCU D. user can define it Question: 4 The methods for scheduling a conference that supports recording include ( ). (Select 3 answers) A. Using the video phone B. Using the SMC C. Using the video terminal web interface D. Using the telepresence system touch panel Wireshark supports packet decoding for various protocols, include ( ). (Select 3 answers) A. IP B. TCP C. RTP D. H.263 Question: 6 Over an H.460 network, private video terminals connect to ( ) in the SETUP phase. A. TSs B. GKs C. Public network terminals D. MCUs Question: 7 A Network Diagnostician remotely instructs another Network Diagnostician to initiate a diagnostic test to a network diagnostician in another network. ( ) A. TRUE B. FALSE Question: 8 In Multi-channel Cascading, the protocols of all multi-channel conference sites must be consistent, but bandwidths can be different. ( ) A. TRUE B. FALSE Question: 9 An MCU belongs to one service areas. A service area can have multiple MCUs. ( ) A. TRUE B. FALSE Question: 10 If two MCUs are cascaded to hold a conference, the MCUs join the conference as virtual sites. () A. TRUE B. FALSE Question: 11 Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. () A. TRUE B. FALSE Answer: B

Question: 12 Multicast allows one or multiple senders (multicast sources) to send one data packet to multiple receivers at a time. ( ) A. TRUE B. FALSE Answer: A Question: 13 MCUs assigned to the same service area must share a prefix. () A. TRUE B. FALSE Question: 14 The six call steps of H.323 apply to all H.323 terminals. () A. TRUE B. FALSE Answer: A Question: 15 In Videoconferencing room the reason Why the illuminance cannot be too low is because camera generates significant white noises under low illuminance using CCD or CMOS. () A. TRUE B. FALSE Answer: A Question: 16 The NLog is part of SMC, Huawei's conference management software. ( ) A. TRUE B. FALSE Answer: A Question: 17 A video terminal on a private network (video terminal A) uses the IP address 10.1.0.10, the static NAT outbound address is 61.1.0.10, and the GK IP address is 61.1.0.11. A video terminal on a public network (video terminal B) uses the IP address 61.1.0.12. Video terminal B can dial ( ) to call video terminal A. A. 10.1.0.10 B. 61.1.0.10 C. 61.1.0.11 D. 61.1.0.12 Answer: B Users can dial the MCU IP address and follow the IVR instructions to create a conference. () A. TRUE B. FALSE Answer: A Question: 19 For INVITE transaction, messages are retransmitted at intervals of ( ) by default. A. 500ms, Is, 2s, 4s, 4s, 4s B. 500ms, Is, 2s, 4s, 8s, 16s C. 500ms, Is, 2s, 4s, 8s, 8s D. 500ms, Is, 2s, 4s, 16s, 16s Answer: B Question: 20 The To tag, From tag, and Call-ID define the SIP relationship between the user agent client (UAC) and user agent server (UAS), which refers to a dialog. () A. TRUE B. FALSE Answer: A When the built-in MCU of a video terminal is used, the video terminal sets up a connection with each other video terminal to join the same conference A. TRUE B. FALSE Which of the following statements is true about 3G network setting on the HD video terminal A. Before setting the 3G parameters, you must ensure that the video terminal license support 3G networks B. The default IP address assignment made is statie in 3g network

c.The HD video terminal is compatible with all d. The APN settings app to all data cards. 3G cards. settings. An audio signal is a representation of sound, typically as an electrical voltage. ( )

ATRUE BFALSE VP9650 MCU is 0 U tall and provides()lots.

A5, 3 B4, 3 C5, 4 D4, 4 For MCU Video Firewall Mode, no proprietary protocol is used and therefore cooperation between end points of different vendors is allowed. ( ) ATRUE BFALSE For Basic request messages, ( ) is used for querying the SIP server capabilities. AINVITE BACK CREGISTER DOPTIONS If the video format set to Smooth, the system ensures the specified video resolution first. ( ) ATRUE BFALSE

n the MCU Video Firewall Mode,the MCU supports IP route configuration so that data can be sent and received using the GE1 port. ( ) ATRUE BFALSE Methods of improving architecture acoustics contain()-(Select 3 answers) Aget short reverberation time Bget low background noise Cget low corridor noises Dget low expected noises

In video firewall mode, the ( ) must register with a GK. AGE1 port BGE1 or GEO port CFE port DGEO port

QUESTION: 1 Basic functions of the firewall include: Content Filtering, User Authentication, VPN, Application Proxy, NAT, Packet Filtering & Status Detection, IDS and Alarming, Logs. ( ) A. TRUE B. FALSE

QUESTION: 2 In any view mode, a site can view the video of any other sites. ( ) A. TRUE B. FALSE

QUESTION: 3 Which does not belong to six major request messages of SIP protocol.() A. ACK B. CANCEL C. SETUP D. BYE

QUESTION: 4 The HD endpoints support point-to-point calls based on(). (Select 3 answers)

A. phone numbers B. site names C. MAC address D. IP address

QUESTION: 5 For SDP, the o line contains parameters related to the session participants. The first parameter indicates (). A. the calling party name B. the session identifier of the calling party C. the network type D. the address type

The upgrade software format of the HD video terminal is ( ). A. .txt B. .dat C. .tkn D. .tp4

QUESTION: 7 An audio signal is a representation of sound, typically as an electrical voltage. ( ) A. TRUE B. FALSE

QUESTION: 8 On an H.460 network, H.245 TCP connections are established between private network terminals and theTS.()

A. TRUE B. FALSE

QUESTION: 9 After NAT is enabled on the video terminal, packet transmission between public and private networks can be implemented in ( ) networking mode. A. Static NAT networking B. DNAT C. NAPT D. All of the above

QUESTION: 10 In Multi-channel Cascading, for one conference, there are a maximum cascaded channels between two MCUs. ( ) A. TRUE B. FALSE

QUESTION: 11 For Remote audio bopback, The test process includes audio input, coding, transmission, loopback from the remote end and aims to check whether the network connection is normal. ( ) A. TRUE B. FALSE

QUESTION: 12

Which of the following statements about HD video terminals is correct. ( ) A. HD video terminals cannot communicate with SD video terminals. B. The HD video terminal must register with the GK for communication. C. The HD video terminal support Far-End Camera Control. D. The HD video terminal web login user name cannot be left blank.

QUESTION: 13 NAT mapping methods include Static NAT,Dynamic NAT and NAFT.() A. TRUE B. FALSE

QUESTION: 14 The advantages of AAC-LD are: low bandwidth; short delay; high voice quality. ( ) A. TRUE B. FALSE

QUESTION: 15 The methods for scheduling a conference that supports recording include ( ). (Select 3 answers) A. Using the video phone B. Using the SMC C. Using the video terminal web interface D. Using the telepresence system touch panel

QUESTION: 16 With static NAT, endpoints on private network have their SRC addresses ( ).

A. Unchanged B. Translated to outbound NAT address C. Translated to an available public IP address D. Translated to the GK address

QUESTION: 17 For Reverberation, The collect tone mainly uses direct sounds. An appropriate amount of reverberation makes human voice more vigorous. Therefore, a proportion % direct sounds in the collect tone is recommended. However, the reverberation after 50 ms makes listeners difficult to understand. It is good practice that the sound energy reaches over 80% after 50 ms. ( ) A. TRUE B. FALSE

QUESTION: 18 NAT types include ( ). (Select 3 answers) A. Static NAT B. Dynamic NAT C. Port mapping D. Protocol mapping

QUESTION: 19 SEC2.0 is used for burst packet loss. () A. TRUE B. FALSE

QUESTION: 20 The RRQ message carrying registration information including the()registers on the GK. (Select 3 answers) A. IP address

B. MAC address C. H.323ID D. Port

QUESTION: 21 The network device connected to an MCU network port must be 100 Mbit/s half-duplex.() A. TRUE B. FALSE

QUESTION: 22 Direct sound is the sound directly from the sound source to the listener, which is required in a conference room. ( ) A. TRUE B. FALSE

QUESTION: 23 The background color uses complementary colors of the skin color to avoid same or similar color display.( ) A. TRUE B. FALSE

QUESTION: 24 The RAS message, specified in H.225, is a protocol used between a node and the gateway. The RAS message implements the management function including registration, access control, and status. () A. TRUE

B. FALSE

QUESTION: 25 The CP function allows displaying the video of two or more sites on the same output device at the same time. The number of the sites to be displayed and the layout of the site videos vary according to CP modes. ( ) A. TRUE B. FALSE

QUESTION: 26 In SIP hierarchical relationship, Request message contains(). (Select 3 answers) A. Request lines/ Response lines B. Non-INVUE transactions C. Header field D. Message body

QUESTION: 27 When the protocol and format have been specified on the endpoint, the sharp and smooth policy becomes invalid. ( ) A. TRUE B. FALSE

QUESTION: 28 When the MCU is in video firewall mode, the original firewall settings (for example, ports that are enabled) must be changed.() A. TRUE B. FALSE

QUESTION: 29 A zone consists of endpoints managed by the GK and the gateway and MCU. In a zone, at least one endpoint must be available and the gateway and MCU are optional.() A. TRUE B. FALSE

QUESTION: 30 Of the messages between GKs, a/an ( ) message is sent by the called terminal to the calling terminal to indicate that the called terminal is off-hook. A. alerting B. proceeding C. setup D. connect

QUESTION: 31 Color rendering index is a quantitative measure of the ability of a light source to reproduce the colors of various objects faithfully in comparison with a standard light source. A smaller value indicates a more faithful color. ( ) A. TRUE B. FALSE

QUESTION: 32 The failover between active and standby GKs is based on the heartbeat communication.() A. TRUE B. FALSE

QUESTION: 33 Intelligent control system contains Video system/ Audio system and others which does not belongs to Video system.0 A. Illumination system B. Audio pickup system C. Video output system D. Video display system

QUESTION: 34 The function of Proxy server is to forwards requests or responses for SIP clients. The proxy server can be a server and a client at one time and decides forwarding requests of the next hop. ( ) A. TRUE B. FALSE

QUESTION: 35 ( ) signaling is used for logical channel closing. A. CLC, CLCA B. OLC, OLCA C. TCSR, TCSA D. MSDR, MSDA

QUESTION: 36 Conferences are not interrupted during the failover between active and standby MCUs.0 A. TRUE B. FALSE

QUESTION: 37 The recording request from a video terminal is sent to the MCU and the MCU controls the recording. ()

A. TRUE B. FALSE

QUESTION: 38 The range of audible frequencies is 20 Hz to 20000 Hz. G.711, G.722, and G.728 support audio signals with a bandwidth ranging from 50 Hz to 7000 Hz. Therefore, for HD video communication, MOLD is used.0 A. TRUE B. FALSE

QUESTION: 39 The file formats exported by Nlog V2.0 are(). (Select 3 answers) A. .TXT B. .csv C. Word D. Image

QUESTION: 40 For MCU Video Firewall Mode, no proprietary protocol is used and therefore cooperation between end points of different vendors is allowed. ( ) A. TRUE B. FALSE

QUESTION: 41 How many GKs can be contained in a zone.() A. two B. only one C. three D. no limitation

QUESTION: 42 RTCP is Real-Time Transport Protocol: RTCP does not address resource reservation and does not guarantee quality-of- service for real-time services. The data transport is augmented by a control protocol (RTCP) not allow monitoring of the data delivery in a manner scalable to large multicast networks, and to provide minimal control and identification functionality. () A. TRUE B. FALSE

QUESTION: 43 Conference room design contains()-(Select 3 answers) A. Illumination B. Acoustics C. Intelligent control D. Conference room spacing

QUESTION: 44 Forward error correction uses an algorithm where the transmitting device sends redundant data and the decoding device restores the data streams using the redundant data.() A. TRUE B. FALSE

QUESTION: 45 Because of the restriction on display size and MCU resources, the number of panes is better within 16. Otherwise, the video cannot be clearly seen due to the size. ( ) A. TRUE B. FALSE

QUESTION: 46 One of the primary uses of RTCP is reception quality reporting, which is accomplished through RTCP receiver report (RR) packets, which are sent by all participants who receive data. ( ) A. TRUE B. FALSE

QUESTION: 47 Bandwidth restriction on specified network segments will result in terminals' GK registration failures.() A. TRUE B. FALSE

QUESTION: 48 RRJ sendto [(218.5.64.98:18616)] [59285094444] [[0x00000065:err_reg_wrong_account_or_password]] As indicated by the preceding log entry, the registration failure cause was that ( ). A. The password was incorrect. B. Registration was restricted on the relevant network segment. C. The bandwidth was restricted on the relevant network segment. D. The communication line is abnormal.

QUESTION: 49 The cascaded conference can have no more than three layers. ( ) A. TRUE B. FALSE

QUESTION: 50

Multichannel audio mixing uses quick voice detection so that background noises can be entirely cut. The traditional simple multichannel audio mixing will not introduce enormous background noises. ( ) A. TRUE B. FALSE

QUESTION: 51 We can choose "Diagnostics > System Information > Specifications" to query the specifications about audio, video, interface, and bandwidth. () A. TRUE B. FALSE

QUESTION: 52 For DVI output, VP 9039S and VP 9039A can support the input resolution p 60 fps of video and presentation. At this time, the resolution of presentation can reach(). A. 1080P B. 7201 C. 10801 D. 720P

QUESTION: 53 In video firewall mode, when the GEO port is registered with the SwitchCentre, the GE1 port can be used to place calls with IP addresses only.() A. TRUE B. FALSE

QUESTION: 54

When the built-in MCU of a video terminal is used, the video terminal sets up a connection with each other video terminal to join the same conference. A. TRUE B. FALSE

QUESTION: 55 A sound test on the video endpoint checks whether the audio output is normal. ( ) A. TRUE B. FALSE

QUESTION: 56 Over an H.460 network, private video terminals connect to ( ) in the SETUP phase. A. TSs B. GKs C. Public network terminals D. MCUs

QUESTION: 57 ( ) methods are available for sites to join an IVR conference. A. 1 B. 2 C. 3 D. 4

QUESTION: 58 The network recording server can simultaneously record conferences and live broadcast them.()

A. TRUE B. FALSE

QUESTION: 59 Methods of improving architecture acoustics contain()-(Select 3 answers) A. get short reverberation time B. get low background noise C. get low corridor noises D. get low expected noises

QUESTION: 60 Banners and captions are multicast.() A. TRUE B. FALSE

QUESTION: 61 Video signals are input into the terminal and transmitted over the network after encoding, compression, displaying, and many other image processing operations, such as: IPC, Preprocessing, Compression coding, Data encapsulation and transmission, Decoding, Image format conversion, Playing. ( ) A. TRUE B. FALSE

QUESTION: 62 The NLog V2 obtains statistics from the ( ). A. B. C. D.

SMC GK Video terminal MCU

QUESTION: 63 Acoustic echoes are local sounds that are returned from the peer end. In this case, ensure that the speaker sound cannot be returned through the microphone. ( ) A. TRUE B. FALSE

QUESTION: 64 The H.323 is used to establish the point-to-point media session and multi-point media conference.() A. TRUE B. FALSE

QUESTION: 65 For static NAT, which of the following statements are true about the signaling sent to set up a call from a public network terminal to a private network terminal. ( ) (Select 3 answers) A. B. C. D.

The caller CS address is a NAT address. The callee CS address is a NAT address. The DST address of a public network terminal is a NAT address. The DST address processed by the firewall is a private network address.

QUESTION: 66 Video compression includes intraframe compression (I-frame) and interframe compression (P-frame). H.26x, MPEG-2, and MPEG-4 support intraframe or interframe compression. ( ) A. TRUE B. FALSE

QUESTION: 67

RTCP provides for loose membership control through RTCP SDES packets, which indicate that some participants have left the session. A SDES packet is generated when a participant leaves the session/ or when it changes its SSRC. ( ) A. TRUE B. FALSE

QUESTION: 68 Banner is used to brief the conference content and captions are used to highlight the conference topic. A. TRUE B. FALSE

QUESTION: 69 In H.460, ( ) defines the traversal of H.323 media streams between public and private networks. A. B. C. D.

H.460.18 H.460.19 H.460.20 H.460.21

QUESTION: 70 The default working mode of the MCU GE1 port is ( ). A. B. C. D.

Video firewall Packet capture Backup Dynamic switching

QUESTION: 71

If the color rendering index is large, the image color saturation decreases and the video image reproduces a color that is greatly different from the true color.() A. TRUE B. FALSE

QUESTION: 72 Video loopback is used to check whether the local video input and output are normal.() A. TRUE B. FALSE

QUESTION: 73 RTP:used for Real-time data packets transmission; RTCP: used for Monitoring of RTP session quality of service (QoS) ( ) A. TRUE B. FALSE

QUESTION: 74 The MCU and network recoding server use ( ) to transmit video streams between each other. A. IP B. H.323 C. SIP D. RTP

QUESTION: 75 After the NAT is enabled on terminals, the packets sent by the terminals can be changed with static NAT, DNAT, or NATP.()

A. TRUE B. FALSE

QUESTION: 76 A dialog is uniquely identified by Call-ID, From tag, and To tag. Once a dialog is established, the three identifier cannot be changed. ( ) A. TRUE B. FALSE

QUESTION: 77 In the following descriptions, which are belong to audio mixing policies. ( ) (Select 3 answers) A. Audio mixing is performed for the several channels with large sound, to prevent noise. B. Audio mixing is performed for the several channels with small sound, to prevent noise. C. The sound can be prevented from sending to an endpoint D. You can configure the system not to process sound from one endpoint

QUESTION: 78 In Header Field, Cseq indicates the unique ID of one invitation or one registration. ( ) A. TRUE B. FALSE

QUESTION: 79 With network-based recording, the audio and video output of any participants (an audio-only, HD, or telepresence participant) can be recorded. You can play back the recorded contents through the web. ( ) A. TRUE B. FALSE

QUESTION: 80 PCM mainly includes sampling, quantization, and encoding. ( ) A. TRUE B. FALSE

QUESTION: 81 If ALM indicator of the MCU is on, and a message is displayed to indicate insufficient license resources when you schedule a conference, the possible cause is that the MCU license does not match the MCU hardware.() A. TRUE B. FALSE

QUESTION: 82 The SDP is not a protocol over the transport layer. The 5DP is applicable to the()-(Select 3 answers) A. B. C. D.

SAP SIP H.323 HTTP

QUESTION: 83 If a video terminal exits a conference unexpectedly, it can dial the special service number to join the conference again.() A. TRUE B. FALSE

QUESTION: 84 1080p and 720p 50/60 fps: Progressively scan an image at the rate or 60 frames per second. ( )

A. TRUE B. FALSE

QUESTION: 85 Dynamic Dual Streams, supports concurrent transmission of ( ) independent images. A. B. C. D.

2 3 4 5

QUESTION: 86 In RTCP packet, Sender report (SR) used for transmission and reception statistics from sending gateways. ( ) A. TRUE B. FALSE

QUESTION: 87 White balance reproduces whiteness to keep the true colors of white objects under casting of any light sources. Specifically, if the white color differentiates under casting of certain light sources, the white balance technique reproduces the whiteness faithfully ( ) A. TRUE B. FALSE

QUESTION: 88 The resolution of Full HD is(). A. B. C. D.

1280x720 1920x1080 1408 x 1152 704x576

QUESTION: 89 To enable video firewall function on an MCU, set the ( ). (Select 3 answers) A. GEO port working mode B. GEO port network parameters C. GEl port network parameters

D. GE1 port working mode

QUESTION: 90 SIP messages are coded based on texts. ( ) A. TRUE B. FALSE

QUESTION: 91 The GK must be installed on drive C or D.() A. TRUE B. FALSE

QUESTION: 92 The system with SEC enabled automatically adjusts error correction strategies for network transmission and video and audio processing using rich QoS modes of IP networks. The packet loss concealment capacity improves more than 60% compared with the industrial level. ( ) A. TRUE B. FALSE

QUESTION: 93 In the stretch mode, the aspect ratio of the input video is adjusted to fit the video for the monitor. The video will be cut. ( ) A. TRUE B. FALSE

QUESTION: 94 In the Videoconferencing System, the requirement for empty auditorium noise must be lower than or equal to().

A. B. C. D.

36dB 38dB 40dB 34dB

QUESTION: 95 The three frame types in H.264 are(). A. B. C. D.

A, Q, P B, I, P C, Q, B T, C, B

QUESTION: 96 By default, the firewall prevents packets sent from networks with lower security levels (Internet) to networks with higher security levels (internal networks), but does not prevent packets from networks with higher security levels to networks with lower security levels.Q A. TRUE B. FALSE

QUESTION: 97 A Network Diagnostician remotely instructs another Network Diagnostician to initiate a diagnostic test to a network diagnostician in another network. ( ) A. TRUE B. FALSE

QUESTION: 98 A Network Diagnostician in a public network initiates a diagnostic test to a Network Diagnostician in a private network. ( ) A. TRUE B. FALSE

QUESTION: 99 Which of the following statements is true about 3G network settings on the HD video terminal. ( )

A. Before setting the 3G parameters, you must ensure that the video terminal license supports 3G networks. B. The default IP address assignment mode is static in 3G network settings. C. The HD video terminal is compatible with all 3G data cards. D. The APN settings apply to all data cards.

QUESTION: 100 For INVITE transaction, messages are retransmitted at intervals of ( ) by default. A. B. C. D.

500ms, Is, 2s, 4s, 4s, 4s 500ms, Is, 2s, 4s, 8s, 16s 500ms, Is, 2s, 4s, 8s, 8s 500ms, Is, 2s, 4s, 16s, 16s

QUESTION: 101 Firewall is a kind of protection to prevent network attack, and protect the legal communication between two networks. ( ) A. TRUE B. FALSE

QUESTION: 102 MCU Video Firewall Mode has advantages, but it also has limitations, such as(). (Select 3 answers) A. The MCU supports communication between only two networks. The communication among more than two networks, however, is not supported. B. The GEO port must register with a GK. The GE1 port is used only for calls by number C. The endpoint at the GE1 side does not support the SiteCall service. D. Sites connected through GE1 ports does not support service switchovers.

QUESTION: 103 Video streams sent from the MCU to the recording server can be ( ) on the server. (Select 3 answers) A. B. C. D.

Live broadcast Played on demand Uploaded Downloaded

QUESTION: 104

In essence, NAT is to change the headers (source address) in packets to NAT addresses.0 A. TRUE B. FALSE

QUESTION: 105 In RTP packet, the sequence number increments by one for each RTP data packet sent, and may be used by the receiver to detect packet loss and to restore packet sequence. ( ) A. TRUE B. FALSE

QUESTION: 106 Only when the remote sites support T.140, banners, captions, or instant messages can be sent to one specific site in T.140 mode. () A. TRUE B. FALSE

QUESTION: 107 A T.140 Caption can be sent or received by only endpoint that support T.140 captions.() A. TRUE B. FALSE

QUESTION: 108 The following descriptions for CR101/CR102 Reach Network Recording & Streaming Server, which is error(). A. It allows users to watch the meetings through the PC browser during the course of the meeting, similar to the live broadcast. B. It allows users to watch the video saved in the Recording & Streaming Server through the PC browser after the meeting ends. C. The Recording & Streaming Server can support the codec functions. D. The Recording & Streaming Servers have the functions of recording and on-demand of the media streaming of the MCU.

QUESTION: 109

Color temperature is a measure of the quality of optical source and spectrum. The unit of the color temperature is lux (Ix).() A. TRUE B. FALSE

QUESTION: 110 ARQ is Similar to the TCP retransmission mechanism, when the network detects UDP packet loss in video stream, it requires the peer to resend UDP stream. The receiver uses a buffer to store code stream, and starts decoding after receiving the retransmitted UDP stream. ( ) A. TRUE B. FALSE

QUESTION: 111 The omnidirectional collect tone suites a big-sized conference room. The omnidirectional collect tone suites a small- sized conference room. ( ) A. TRUE B. FALSE

QUESTION: 112 White balance changes the overall mixture of colors in an image by using camera electrics to balance the color differences, and thereby getting colors appear correct or pleasing. ( ) A. TRUE B. FALSE

QUESTION: 113 An MCU belongs to one service areas. A service area can have multiple MCUs. ( ) A. TRUE B. FALSE

QUESTION: 114 () is added into the SIP in June, 2002, which is the core standard of the SIP. A. B. C. D.

RFC3263 RFC3262 RFC3261 RFC3264

QUESTION: 115 For Ad Hoc conference, users can create and join an ad hoc conference conveniently from terminals by following video and audio instructions. ( ) A. TRUE B. FALSE

QUESTION: 116 In Videoconferencing room the reason Why the illuminance cannot be too low is because camera generates significant white noises under low illuminance using CCD or CMOS. ( ) A. TRUE B. FALSE

QUESTION: 117 In video firewall mode, the ( ) must register with a GK. A. GE1 port B. GE1 or GEO port C. FE port D. GEO port

QUESTION: 118 The H.460 protocol consists of ( ) (Select 2 answers) A. H.460.17

B. H.460.18 C. H.460.19 D. H.460.20

QUESTION: 119 In the MCU Video Firewall Mode, the MCU supports IP route configuration so that data can be sent and received using the GE1 port. ( ) A. TRUE B. FALSE

QUESTION: 120 The H.460.18 specifies the public-private network traversal process of the media stream of H.323-() A. TRUE B. FALSE

QUESTION: 121 The MP implements communication of control messages between video terminals.() A. TRUE B. FALSE

QUESTION: 122 For Request message, which one is optional (). (Select 2 answers) A. Request lines B. Response lines C. Header field D. Message body

QUESTION: 123

Non-T.140 Caption can be sent and received only by H.323 endpoints. ( ) A. TRUE B. FALSE

QUESTION: 124 A GK responds to a gateway's access authentication and address resolution request with a/an ( ) message for request rejection with resolution results. A. RRJ B. GRJ C. URJ D. ARJ

QUESTION: 125 The MCU needs to decode videos of all endpoints involved in the continuous presence, code the video into one channel of video, and transmit the video to all endpoints that need to view the continuous presence.() A. TRUE B. FALSE

QUESTION: 126 ARQ carries information about the MCU including the IP address and port number and number about the endpoint to be called.() A. TRUE B. FALSE

QUESTION: 127 The audio test on the video terminal checks whether the audio output of the video terminal is correct. () A. TRUE B. FALSE

QUESTION: 128 The signaling "setup" means the calling endpoint sends a call request to the called endpoint.() A. TRUE B. FALSE

QUESTION: 129 For Response Messages, 3XX meansOA. Indicates that the request is received and under processing B. Indicates that the response is received and successfully processes. C. Indicates that further operations are required to complete this request. D. Indicates that the server is faulty and consequently cannot process correct messages.

QUESTION: 130 The MP can provide the following functions.() (Select 2 answers) A. Stream forwarding B. Call C. Rate adaptation D. Conference control

QUESTION: 131 The packet loss statistics collected by the NLog V2 does not include the packet loss for the data communications devices on the relevant lines.() A. TRUE B. FALSE

QUESTION: 132 A transaction must contain (). (Select 3 answers) A. A request message B. ACK

C. One final response message D. Zero or more provisional response messages

QUESTION: 133 For the following technologies used for traversal between public and private networks, no additional network device is required. ( ) (Select 2 answers) A. H.460 B. ALG C. Static NAT D. SNP

QUESTION: 134 Wireshark captures packets over various interfaces, except WLAN ports. ( ) A. TRUE B. FALSE

QUESTION: 135 Over an H.460 network, TCP connections are initiated and set up by ( ). A. TSs B. Public network terminals C. Private network terminals D. None of the above

QUESTION: 136 Audio Signal Processing from audio input to audio playing, mainly including: Inputting analog audio signals, Sampling/Quantizing/Encoding audio signals, Playing audio signals, Decoding audio signals. Transmitting/Storing audio signals. ( ) A. TRUE B. FALSE

QUESTION: 137 The remote video loopback checks whether video data is transmitted properly on the network to determine whether the remote video module is working correctly.() A. TRUE B. FALSE

QUESTION: 138 The NLog V2 requires a flash player plug-in to be fully functional. () A. TRUE B. FALSE

QUESTION: 139 The H.225 used for medial channel control including call signaling (Q.931) and RAS communication between endpoints and the GK. () A. TRUE B. FALSE

QUESTION: 140 The video firewall mode is a simple method used for traversal between private and public networks. Different network interfaces of the MCU are connected to different networks so that endpoints on different networks can participate in the same conference. ( ) A. TRUE B. FALSE

QUESTION: 141 Which message indicates that the server is faulty and consequently cannot process correct messages. ( )

A. 1xx B. 3xx C. 5xx D. 6xx

QUESTION: 142 The default IVR access number for joining a conference is ( ). A. 168 B. 5000 C. 8000 D. 9000

QUESTION: 143 If two MCUs are cascaded to hold a conference, the MCUs join the conference as virtual sites. () A. TRUE B. FALSE

QUESTION: 144 Private and public network terminals are registered with a GK. A private network terminal has NAT disabled. If a public network terminal fails to call this private network terminal, what is the root cause?( ) A. The public network terminal fails to obtain the RRQ information of the private network terminal. B. The public network terminal fails to locate the source port of the private network terminal. C. The destination address of a SETUP message is a private network address, because the address of the CS is specified in the RRQ message from a private network terminal and does not change after NAT. D. The called CS address in the ACF message sent by the GK is incorrect.

QUESTION: 145 The HD endpoints support the ITU-T G.711, G.722, G.728, AACLD (mono-or binaural-audio channel), and HWA-LD audio protocols, showing a strong audio compatibility()

A. TRUE B. FALSE

QUESTION: 146 MSDA is Master Slave Determination Acknowledge (The carried Master or Slave flag refers to the status of the local endpoint.) ( ) A. TRUE B. FALSE

QUESTION: 147 The NLog is part of SMC, Huawei's conference management software. ( ) A. TRUE B. FALSE

QUESTION: 148 The advantages and disadvantages of Automatic Repeat request (ARQ) are Q. (Select 2 answers) A. it has high requirements for latency, which makes it difficult to use in live networks, it is effective only in slight packet loss. In addition, it results in more video jitter B. it occupies little bandwidth and slightly impacts the video quality C. The video quality is affected because the redundant data occupies some bandwidth. In addition, it cannot handle burst packet loss, and a certain delay is introduced D. it can restore the lost data with a certain probability and it is applicable to common packet loss scenarios

QUESTION: 149 An MCU is an audio/video processing and forwarding device based on the H.323 protocol.() A. TRUE B. FALSE

QUESTION: 150

A color bar test on the video endpoint checks whether the color of video output is normal or not. () A. TRUE B. FALSE

QUESTION: 151 Audio mixing is to mix the several sites with the largest sounds, except for the local site, not to mix the sounds of all sites. ( ) A. TRUE B. FALSE

QUESTION: 152 Which of the following ports is the default service network port of the MCU. ( ) A. GEO B. GE1 C. FE D. RS232

QUESTION: 153 Which of the following statements are true about the signaling traversal solution using H.460? ( ) (Select 3 answers) A. Public network terminals use H.323 to send ARQ messages to private network terminals. B. The TS sends standard SCI messages to private network terminals to ask public network terminals to call the TS back. C. TCP channels between private network terminals and the TS are established by private network terminals. D. After the TCP channel is established, the private network terminal is directly connected to the public network terminal.

QUESTION: 154 If a GK, by resolving the called number, finds that the called terminal registers with a neighboring GK, the GK can request the neighboring GK to resolve the called number. A. TRUE B. FALSE

QUESTION: 155 RFC2190 defines three formats for H.263 payload header: modes A, B, and C. Mode A is recommended and also the most common one. ( ) A. TRUE B. FALSE

QUESTION: 156 In RTP packet, the timestamp reflects the sampling instant of the first octet in the RTP data packet. The sampling instant must be derived from a clock that increments monotonically and linearly in time to allow synchronization and jitter calculations. The initial value of the timestamp should be random. It increases by 1 with each increasing packet. ( ) A. TRUE B. FALSE

QUESTION: 157 Area management is implemented by ( ). A. GK B. SMC C. MCU D. HD video terminal

QUESTION: 158 Loudness is an auditory sensation in terms of which sounds can be ordered on a scale extending from quiet to loud. Loudness may be quantified by the amplitude of sound waves. ( ) A. TRUE B. FALSE

QUESTION: 159 For Rack MCU, we can configure two main control boards for redundancy backup. On the SMC, you just need to configure one IP address for the active and standby main control boards. ()

A. TRUE B. FALSE

QUESTION: 160 In a conference, two cascaded MCUs can be cascaded using up to ( ) channels. A. 8 B. 16 C. 24 D. 32

QUESTION: 161 Different from traditional video conferences, ad hoc conferences can be created and joined from video terminals, without the assistance from administrators.() A. TRUE B. FALSE

QUESTION: 162 The SMC platform is Huawei's videoconferencing service management platform/ which implements uniform management, scheduling of video conferences, and controlling of video conferences, to make conference management faster and simpler for customers. ( ) A. TRUE B. FALSE

QUESTION: 163 In H.323 protocol, opening the logical channel follows the rule of "who want to transmit, who open it". () A. TRUE B. FALSE

QUESTION: 164 For VGA output, the maximum pixels are().

A. 1920*1080 B. 1280*1024 C. 1366*768 D 1360*768

QUESTION: 165 RFC 3550 defines()RTCP packet types to carry a variety of control information. A. 3 B. 4 C. 5 D. 6

QUESTION: 166 For Network-based Recording, no MCU resource is used and the running status of the video conference is not affected. () A. TRUE B. FALSE

QUESTION: 167 Methods for upgrading the MCU software include ( ). (Select 2 answers) A. Upgrade using the embedded web server B. Upgrade using FTP C. Minimized upgrade D. All of the above

QUESTION: 168 The video firewall mode does not require additional network devices for public/private traversal.() A. TRUE B. FALSE

QUESTION: 169 The H.225 defines ( ) signaling. (Select 2 answers) A. Q.931 B. H.281 C. RAS D. T.120

QUESTION: 170 A transaction only can be identified by a unique branch.() A. TRUE B. FALSE

QUESTION: 171 One conference allows for up to ( ) groups of continuous presence. A. 1 B. 12 C. 24 D. 96

QUESTION: 172 Reverberation time refers to the period of time taken for a specified decrease (usually 60 dB) in sound pressure level at a given frequency and point in an enclosed or partly enclosed space, after the sound signal from an acoustic source is interrupted. Generally, the reverberation time is represented using T60. ( ) A. TRUE B. FALSE

QUESTION: 173 RTP is Real-time Transport Control Protocol: RTP provides endto-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. ( ) A. TRUE B. FALSE

QUESTION: 174 Which message is used for Endpoint registration.() A. RCF B. ACF C. LCF D. INAK

QUESTION: 175 The Content header field contains the attributes of message bodies/'Content-Length" specifies the length of the message body, which is optional for the TCP packets and mandatory for UDP packets. ( ) A. TRUE B. FALSE

QUESTION: 176 An MCU endpoint number during a conference consists of ( ). (Select 2 answers) A. MCU prefix B. Sub conference ID C. Service area number D. Site number

QUESTION: 177 An SIP response message consists of(). (Select 3 answers) A. response start line B. header C. message body D. request start line

QUESTION: 178 The H.239: A maximum i resolution is supported for dual-streams, which is the best dual-stream processing capability in the industry.( ) A. TRUE B. FALSE

QUESTION: 179 ( ) signaling is used for master/slave determination. A. GRQ,GCF B. DRQ, DCF

C. TCSR,TCSA D. MSDR, MSDA

QUESTION: 180 The SIP works on the basis of messages which are the base units for the interaction between the SIP client and server(). A. TRUE B. FALSE

QUESTION: 181 The recoded files can be downloaded and played locally in()format. A. .FLV B. .WMV C. .RMVB D. .MTV

QUESTION: 182 NAT is used to translate addresses between the private network and public network.() A. TRUE B. FALSE

QUESTION: 183 Call abnormalities occur when non-compatible firewalls start the H.323 ALGs. () A. TRUE B. FALSE

QUESTION: 184 SIP and H.323 video terminals can send and receive T.140 captions. () A. TRUE B. FALSE

QUESTION: 185

Users can dial a conference ID and follow the IVR instructions to create a video conference.() A. TRUE B. FALSE

QUESTION: 186 Color rendering index affects the()-(Select 2 answers) A. true color reproduction B. image color saturation C. lighte D. Color temperature

QUESTION: 187 The GK must support BRQ, BCF, and BRJ messages and accept all requests for changing bandwidth. ( ) A. TRUE B. FALSE

QUESTION: 188 If the()at the transmit end and receive end are consistent,the MCU can directly forward the video stream. (Select 3 answers) A. video protocols B. formats C. video type D. bandwidths

QUESTION: 189 The MCU supports ( ) concurrent web users. A. 1 B. 2 C. 3 D. More than three

QUESTION: 190 In order to get low background noise, we can Commission or replace daylight lamp holders, and adjust or re-arrange air ducts and air vents of the conditioner ( )

A. TRUE B. FALSE