The VDC can be used with the Huawei video conferencing platform to provide rich conference
control functions. Conference control settings can be customized, and conference control shortcut
keys and descriptions can be set.
A
Explanation:
The Huawei Video Conferencing Desktop Client (VDC) offers comprehensive conference-control
capabilities, allowing you to tailor control settings and define custom shortcut keys with descriptive
labels for streamlined operation.
By default, a single registration SC server supports a maximum of 20,000 registered devices.
A
Explanation:
By default, a Registration SC server supports up to 20,000 registered devices, as specified in the
Huawei SC product specifications.
Which of the following statements are true about the multi-level protection of the collaboration
hardware platform? (Choose all that apply.)
A, B, C, D
Explanation:
The collaboration hardware platform implements full redundancy: network ports, fans, power
supplies, and disks (RAID) - to ensure high availability and fault tolerance.
Which of the following is the maximum number of cascaded conference levels supported by the
SMC?
B
Explanation:
Huawei’s SMC supports cascading up to four conference levels for multi-level conferencing, ensuring
efficient management and control across up to four tiers.
Which of the following network elements can be utilized to centrally manage and control, remotely
schedule shutdowns, and perform batch OTA upgrades for 10,000 IdeaHub ES2 Plus devices?
B
Explanation:
The IdeaManager platform is designed for large-scale IdeaHub device management, offering
centralized control, remote shutdown scheduling, and batch over-the-air upgrades for fleets of up to
millions of devices, including 10,000 ES2 Plus units.
In the collaboration solution architecture, which of the following network elements are deployed at
the media processing layer? (Choose all that apply.)
B, C
Explanation:
The media processing layer handles core media functions such as audio/video encoding, decoding,
mixing, recording, and streaming. The VP9860 is Huawei’s MCU media server - deployed precisely in
this media processing (media switching) layer to provide high-density encoding/decoding and mixing
capabilities. CloudRSE (Cloud Recording & Streaming Engine) delivers recording and streaming
services, which are also key media processing functions within this layer.
Assume that a dual-channel audio file uses the PCM encoding, the sampling frequency is 8 kHz, and
each quantized sample value corresponds to an 8-bit binary code. What is the encoding rate (kbit/s)
of the audio file?
A
Explanation:
Dual-channel PCM at 8 kHz with 8 bits per sample yields 8,000 × 8 = 64 kbit/s per channel; two
channels give 64 × 2 = 128 kbit/s.
Generally, the bandwidth actually occupied by a video conference is greater than the conference
bandwidth. What are the possible causes? (Choose all that apply.)
A, B, C, D
Explanation:
The actual bandwidth exceeds the nominal conference bandwidth because of protocol overhead
(both IP and UDP headers), signaling exchanges, and any retransmissions of lost packets, all of which
consume additional capacity.
Assume that a channel of 4CIF analog TV signal uses a 48-bit color depth. Which of the following is
nearest to the stream transmission speed of the signal before compression and encoding?
D
Explanation:
4CIF (704×576) at 30 fps gives 704 × 576 × 30 ≈ 12.17 million pixels/s. At 48 bits per pixel, that’s
12.17 M × 48 ≈ 584 Mbit/s, which is nearest to 600 Mbit/s.
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.
A
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.
Which of the following statements is true about image sampling?
A
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.
Which of the following header fields is used to indicate the route of a response message?
A
Explanation:
The Via header records each hop a request takes and is used to route the corresponding response
back along the same path.
FILL BLANK
In a SIP-only multipoint conference, when a participant sends the presentation, the system uses the
____________ protocol for presentation. (Enter the abbreviation.)
BFCP
Explanation:
In SIP-only multipoint conferences, presentation content is delivered using the Binary Floor Control
Protocol (BFCP), which handles floor control and content distribution.
The start line of a SIP response consists of three parts: method (Method), request URI (Request-URI),
and protocol version (SIP-VERSION).
B
Explanation:
A SIP response start line is a Status-Line containing the SIP version, status code, and reason phrase -
not the method and Request-URI.
SIP and SDP are independent of each other. SIP can implement multimedia calls independently to
add new applications or media easily.
B
Explanation:
SIP relies on SDP for session description in multimedia calls; it cannot negotiate media parameters
independently of SDP.