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H11-861_V4.0
HCIP-Collaboration V4.0 Questions and Answers

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Questions # 11:

SIP and SDP are independent of each other. SIP can implement multimedia calls independently to add new applications or media easily.

Options:

TRUE

FALSE

Answer

Explanation

SIP relies on SDP for session description in multimedia calls; it cannot negotiate media parameters independently of SDP.

Questions # 12:

Which of the following statements is false about point-to-point calls?

Options:

During a point-to-point call, the Alerting signaling is used during the H.225/RAS connection.

During a point-to-point call, the called endpoint sends a call request to the GK after receiving a SETUP message.

During a point-to-point call, the GK receives two call requests.

During a point-to-point call, H.245 performs capability set matching before the logical channel is opened.

Answer

Explanation

Alerting is part of the H.225 call-signaling sequence, not the RAS interface, so it is not used over the RAS channel.

Questions # 13:

Which of the following statements is true about image sampling?

Options:

The YUV 4:2:0 sampling mode is half the size of the YUV 4:4:4 sampling mode.

For human eyes, the Y component in YUV is the most important. Therefore, downsampling can be performed on the UV components.

RGB components have weak correlation, which is unfavorable for video image compression. Therefore, RGB is often used for image display.

The transmission rate of video data using YUV 4:2:0 is 140 Mbit/s. If the 4:2:2 mode is used, the transmission rate required by the video is 175 Mbit/s.

Answer

Explanation

YUV 4:2:0 subsamples chroma by a factor of two in both horizontal and vertical dimensions, reducing total data to half of the full-resolution YUV 4:4:4 format.

Questions # 14:

At an SMC video conferencing system site, the customer wants to deploy a conferencing system with converged firewall ports, with a planned DMZ. The SC1 is deployed on the intranet and SC2 is deployed in the DMZ. In this case, which of the following deployment modes is the most suitable one for SC1 and SC2?

Options:

SC1 and SC2 are both registration SCs.

SC1 is the registration SC, and SC2 is the proxy SC.

SC1 is the proxy SC, and SC2 is the registration SC.

SC1 and SC2 are both proxy SCs.

Answer

Explanation

Deploying SC1 as the registration SC on the intranet allows internal endpoints to register directly, while placing SC2 as a proxy SC in the DMZ handles external signaling traversal and secures the demilitarized zone.

Questions # 15:

An AVC conference is scheduled on the CloudMCU (working in SFU mode) and VP9850 (working in IAU mode). After the conf get strmInfo 41353221 command is executed on the CloudMCU, the following information is displayed:

Question # 15

Which of the following is the video stream number generated after the IAU decodes and re-encodes the three video streams of Site (16), Site (17), and Site (18)?

Options:

2710124363957

2710124429801

2710124429802

2710124429803

Answer

Explanation

In SFU+IAU mode, the IAU’s re-encoded (decoded and encoded) streams are identified by the MpAdaptStrmNo value under Site(18). In the output, MpAdaptStrmNo[2710124429803] is the stream number carrying all three re-encoded video channels.

Questions # 16:

Which of the following information is displayed when you run the CloudMCU debugging command “mswt-media allflow”?

Options:

Conference and participant numbers of the ongoing conferences on the MCU

Current system information of the CloudMCU

MCU operation logs

Bit rates of all ongoing streams

Answer

Explanation

The mswt-media allflow command reports the bit rates of all ongoing media streams on the CloudMCU; it does not display conference/participant counts, system info, or logs.

Questions # 17:

Currently, the widely used video compression standards include H.263, H.264, H.265, MPEG-1, MPEG-2, and MPEG-4. The H.26X series standards are mainly used for real time video communication, and the MPEG series standards are mainly used for video storage (DVD), video broadcast, and video streaming media.

Options:

TRUE

FALSE

Answer

Explanation

The H.26x family (H.263, H.264/AVC, H.265/HEVC) was designed with low-latency, real-time encoding/decoding in mind (ideal for videoconferencing and streaming calls) whereas MPEG-1/2/4 were originally optimized for file-based storage (VCD/DVD), broadcast and progressive streaming. Modern deployments often blend these. For example, using H.265 for both live calls and high-efficiency streaming and newer standards (like H.266/VVC) are now emerging.

Questions # 18:

In the non-DMZ public-private network traversal scenario (small- and medium-sized network where the SMC and SC are co-deployed), you need to configure the LAN2 port of the SC as the default routing port.

Options:

TRUE

FALSE

Answer

Explanation

In a co-deployed small/medium network, LAN1 is used for the default gateway to the SMC/public network; LAN2 serves the private segment, so you do not set LAN2 as the default routing port.

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