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NEW QUESTION # 15
Which of the following header fields is used to indicate the route of a response message?
- A. Contact
- B. To
- C. From
- D. Via
Answer: D
Explanation:
The Via header records each hop a request takes and is used to route the corresponding response back along the same path.
NEW QUESTION # 16
The Record-Route header field indicates the route of a request.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
The Record-Route header is inserted by proxies to advertise their desired route for subsequent requests in the dialog.
NEW QUESTION # 17
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?
- A. When MCUs of the new architecture are cascaded, both the cascading channel and proxy channel consume bandwidth and codec resources.
- B. When the MCU of the old architecture is cascaded with the MCU of the new architecture, the cascading channel consumes bandwidth and codec resources.
- C. When the MCU of the old architecture is cascaded with the MCU of the new architecture, the proxy channel consumes bandwidth and codec resources.
- D. When MCUs of the old architecture are cascaded, the cascading channel consumes bandwidth and codec resources.
Answer: B
Explanation:
When cascading an old-architecture MCU with a new-architecture MCU, only the proxy channel on the new side consumes bandwidth and codec resources - the legacy MCU's cascading channel is not used.
NEW QUESTION # 18
Which of the following registration information types are carried in an RRQ to register with the GK? (Choose all that apply.)
- A. IP address
- B. Port number
- C. MAC address
- D. H.323 ID
Answer: A,B,D
Explanation:
An RRQ conveys the endpoint's network address information (IP address and associated port number) along with its H.323 ID alias to the gatekeeper for registration.
NEW QUESTION # 19
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. TRUE
- B. FALSE
Answer: 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.
NEW QUESTION # 20
The MCU debugging command "mswt-media config_info" is used to query the configuration information about media exchange.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
The mswt-media config_info command displays static media configuration parameters; querying actual media-exchange status requires the mswt-media exchange_info command.
NEW QUESTION # 21
Assume endpoints T1 and T2 are registered with the same SC node zone. After T1 calls the number of T2 using H.323, T1 and T2 communicate with each other. Which of the following statements are true about the call process? (Choose all that apply.)
- A. In this process, the H.225 call signaling interaction between T1 and T2 must pass through the SC.
- B. In this process, the H.225 RAS signaling interaction between T1 and T2 must pass through the SC.
- C. Endpoint control signaling involved in this process mainly includes H.225 RAS, H.225 Call Signaling, and H.245.
- D. 225 RAS messages (registration, admission, status) always traverse the SC (gatekeeper) for endpoints in the same zone.
- E. In this process, the media stream must be directly transmitted between T1 and T2.
Answer: B,C,E
Explanation:
RTP media is exchanged directly between T1 and T2 once the call is established.
The call control sequence involves H.225 RAS (registration/admission), H.225 call signaling (SETUP/CONNECT), and H.245 control for capabilities.
NEW QUESTION # 22
The main functions of H.245 include capability negotiation, video encoding, and master-slave determination.
- A. FALSE
- B. TRUE
Answer: A
NEW QUESTION # 23
In the encrypted conference scenario, the SIP transmission type must be set to TLS on both the MCU and endpoint.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
To secure SIP signaling in an encrypted conference, both the MCU and endpoints must use TLS as the transport for SIP messages.
NEW QUESTION # 24
Which of the following statements are true about the SC cluster reconstruction deployment scenario? (Choose all that apply.)
- A. If the number of SIP endpoints is far less than that of H.323 endpoints, you are advised not to deploy the SC cluster.
- B. If the number of connected extranet soft clients is greater than 2000, you are advised to reconstruct a non-cluster proxy SC into a proxy SC cluster.
- C. If the number of SIP endpoints is much greater than that of H.323 endpoints, an SC cluster can be deployed for SIP endpoint access. The non-cluster registration SC is reserved for H.323 endpoint access.
- D. If the number of SIP endpoints is much greater than that of H.323 endpoints, an SC cluster can be deployed for SIP and H.323 endpoint access.
Answer: A,B,C
Explanation:
When SIP endpoints greatly outnumber H.323 endpoints, you deploy an SC cluster to serve the SIP devices while leaving a standalone SC for the H.323 endpoints.
If SIP registrations are much fewer than H.323 registrations, clustering the SC for SIP isn't recommended, as the scale doesn't justify the added complexity.
A proxy SC supports up to 2,000 external soft-client registrations; if you exceed this, you should rebuild it as a proxy-SC cluster to handle the extra load.
NEW QUESTION # 25
SIP is an application-layer protocol independent of the transport-layer protocols. It can be carried over different transport protocols, such as UDP, TCP, TLS, and SCTP. Currently, SCTP is the most commonly used transport-layer protocol.
- A. FALSE
- B. TRUE
Answer: A
Explanation:
While SIP is transport-agnostic and can run over UDP, TCP, TLS, or SCTP, UDP remains the predominant transport - SCTP is not the most commonly used.
NEW QUESTION # 26
In the SIP protocol, the Via header field indicates the route of the subsequent response message.
- A. TRUE
- B. FALSE
Answer: A
Explanation:
The Via header tracks each hop of the request and is used to guide the response back along the same path.
NEW QUESTION # 27
Which of the following information is displayed when you run the CloudMCU debugging command "mswt-media allflow"?
- A. Conference and participant numbers of the ongoing conferences on the MCU
- B. MCU operation logs
- C. Bit rates of all ongoing streams
- D. Current system information of the CloudMCU
Answer: C
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.
NEW QUESTION # 28
FILL in BLANK
The stream transmission speed of a digitalized 1080p 60 fps analog TV signal is around ____________ Mbit/s. (Assume that a pixel is 24-bit and enter an integer.)
Answer:
Explanation:
2986
Explanation:
Uncompressed 1080p at 60 fps has 1920 × 1080 = 2,073,600 pixels per frame. At 24 bits per pixel, that's 2,073,600 × 24 = 49,766,400 bits per frame. Multiplied by 60 fps gives 2,985,984,000 bit/s, which is approximately 2986 Mbit/s.
NEW QUESTION # 29
FILL in BLANK
Assume endpoints T1 and T2 are registered with the same SC node zone (signaling routing is disabled on the SC). After T1 calls the number of T2 using H.323, T1 and T2 communicate with each other. In this process, a total of ____________ TCP connection(s) need to be established between T1 and T2. (Enter an Arabic numeral.)
Answer:
Explanation:
2
NEW QUESTION # 30
FILL BLANK
In a SIP-only multipoint conference, when a participant sends the presentation, the system uses the ____________ protocol for presentation. (Enter the abbreviation.)
Answer:
Explanation:
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.
NEW QUESTION # 31
The start line of a SIP response consists of three parts: method (Method), request URI (Request-URI), and protocol version (SIP-VERSION).
- A. FALSE
- B. TRUE
Answer: A
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.
NEW QUESTION # 32
The SMC system O&M engineer John wants to start and stop the SC database (version V600R019C10SPCb20 or later). Which of the following user roles can be used to perform such operations on the database?
- A. gauss
- B. vcexpert
- C. root
- D. sc
Answer: A
Explanation:
The SC's underlying database is a GaussDB cluster, and only the dedicated database OS user (gauss) has the necessary permissions to start and stop it using the GaussDB control utilities.
NEW QUESTION # 33
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