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H11-861 Online Practice Questions

HCIP-Collaboration V4.0

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Question 1 Single choice

The local camera preview is normal, but the far end sees intermittent blockiness and freezes that coincide with RTP packet-loss spikes. Where should analysis begin?

  1. A

    Local lighting and camera exposure settings

  2. B

    Far-end display color calibration settings

  3. C

    Room acoustics and microphone gain settings

  4. D

    RTP loss and decoder recovery behavior

Show answer and explanation

Correct answer: D

Explanation

A normal local preview establishes that camera capture is working before transmission. Because the far-end blockiness and freezes coincide with RTP packet-loss spikes, analysis should follow the impaired media path: quantify RTP loss and examine how the decoder recovers from missing data. Lighting, color calibration, and microphone settings do not explain this network-correlated video failure.

Question 2 Single choice

Which of the following statements is false about SVC intelligent forwarding conferences?

  1. A

    In an SVC intelligent forwarding conference, the video resolution viewed by each participant varies depending on the endpoint bandwidth and capability of SVC participants.

  2. B

    When the MCU works in SFU mode, the SVC intelligent forwarding conference is supported.

  3. C

    In an SVC intelligent forwarding conference, an SVC endpoint can send a maximum of six channels of video streams to the MCU.

  4. D

    In an SVC intelligent forwarding conference, the Box 310/610 can join a conference with the SVC capability.

Show answer and explanation

Correct answer: C

Explanation

SVC intelligent forwarding can adapt the viewed resolution to participant bandwidth and endpoint capability, and it is associated with MCU operation in SFU mode. The statement imposing a maximum of six video stream channels sent by an SVC endpoint is the false one; that specific six-channel limit does not describe this conference behavior.

Question 3 Single choice

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.

  1. A

    TRUE

  2. B

    FALSE

Show answer and explanation

Correct answer: A

Explanation

The statement correctly distinguishes the primary application focus of the two standard families. H.263, H.264, and H.265 are widely used to compress video for real-time communication, while MPEG standards are commonly associated with stored video, broadcasting, and streamed media. These are all established video compression standards.

Question 4 Single choice

The new and old MCU architectures differ in bandwidth and codec resource usage during cascading. The new architecture supports multiple working modes, such as MCU, SFU, and IAU. The old architecture does not provide different working modes of the MCU.

Which of the following statements is false about MCU cascading?

  1. A

    When the MCU of the old architecture is cascaded with the MCU of the new architecture, the proxy channel consumes bandwidth and codec resources.

  2. B

    When MCUs of the old architecture are cascaded, the cascading channel consumes bandwidth and codec resources.

  3. C

    When the MCU of the old architecture is cascaded with the MCU of the new architecture, the cascading channel consumes bandwidth and codec resources.

  4. D

    When MCUs of the new architecture are cascaded, both the cascading channel and proxy channel consume bandwidth and codec resources.

Show answer and explanation

Correct answer: C

Explanation

Resource accounting depends on the architectures being cascaded and on whether traffic uses a cascading channel or a proxy channel. In a mixed old-MCU and new-MCU cascade, the proxy channel consumes bandwidth and codec resources. Attributing that consumption to the cascading channel instead makes the stated mixed-architecture relationship false.

Question 5 Single choice

Which of the following MCU debugging commands is used to display detailed information about a specified conference?

  1. A

    conf get iaures [confNum]

  2. B

    conf get strmInfo [confnum]

  3. C

    conf get csdchaninfo [confnum]

  4. D

    conf get [confNum]

Show answer and explanation

Correct answer: D

Explanation

The command conf get [confNum] takes the conference number as its direct argument and returns the detailed record for that specified conference. The other commands add specialized subcommands for narrower information, such as stream or channel details, rather than serving as the general conference-detail query.

Question 6 Single choice

Assume endpoints T1 and T2 are registered with the same SC node zone (signaling routing is enabled on the SC). After T1 calls the number of T2 using H.323, T1 communicates with T2.

How many TCP connections are established in this process?

  1. A

    2

  2. B

    4

  3. C

    3

  4. D

    5

Show answer and explanation

Correct answer: B

Explanation

Enabling signaling routing keeps the SC between the two endpoints instead of allowing direct endpoint-to-endpoint signaling connections. The H.225 call-signaling path is split into T1-to-SC and SC-to-T2 connections, and the H.245 control path is split the same way. Two connections for each signaling function produce 4 TCP connections.

Question 7 Single choice

The Record-Route header field indicates the route of a request.

  1. A

    TRUE

  2. B

    FALSE

Show answer and explanation

Correct answer: A

Explanation

A SIP Record-Route field lets signaling nodes place themselves in the dialog's route set. That route set is then used to direct subsequent requests within the dialog through those nodes. Its purpose is therefore associated with the route of requests, rather than the hop-by-hop return path of a single response, which is represented by Via.

Question 8 Single choice

The Call priority protocol on the Box 310 endpoint is set to SIP by default.

  1. A

    TRUE

  2. B

    FALSE

Show answer and explanation

Correct answer: B

Explanation

The statement assigns SIP as the factory default for the Box 310 Call priority protocol, but that default-value claim is false. The key distinction is between a protocol being part of call configuration and that protocol being preselected by default. The endpoint's default configuration therefore cannot be described as Call priority protocol set to SIP.

Question 9 Single choice

The main functions of H.245 include capability negotiation, video encoding, and master-slave determination.

  1. A

    TRUE

  2. B

    FALSE

Show answer and explanation

Correct answer: B

Explanation

H.245 handles control functions such as capability negotiation, master-slave determination, and opening logical channels. It can negotiate which video encoding capability the endpoints will use, but it does not itself encode the video. Treating video encoding as an H.245 function makes the combined statement false.

Question 10 Single choice

Forcing a newly available codec on an endpoint causes conference joins to fail because the managed MCU does not support that codec. What should be done before deployment?

  1. A

    Increase the camera frame rate and retry the call.

  2. B

    Change the peripheral profile without testing conference negotiation.

  3. C

    Keep the codec because the local endpoint accepted its setting.

  4. D

    Select an end-to-end supported codec and verify renegotiation.

Show answer and explanation

Correct answer: D

Explanation

A codec setting succeeds only when every required component in the conference path can negotiate and process that codec. Local acceptance by the endpoint does not overcome the managed MCU's lack of support. Before deployment, select a codec supported end to end and verify renegotiation so joins continue to succeed under the intended configuration.