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| Section | Weight | Objectives |
|---|---|---|
| Video conferencing protocols | 18% | - Basics of H.323 - Basics of SIP |
| O&M of video conferencing endpoints | 28% | - Device performance monitoring and troubleshooting - Deployment and configuration of endpoints |
| Collaboration technology and product overview | 13% | - Huawei collaboration product features - Principles of enterprise collaboration solutions |
| MCU and recording/streaming solutions | 17% | - Recording/streaming solution basics - MCU deployment and operation |
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問題 #49
If a video-conferencing endpoint is not registered with the server by using H.323 or SIP, endpoint A can make a point-to-point call to endpoint B by using endpoint B's IP address, provided that the two endpoints can communicate with each other.
答案：B
解題說明：
Huawei video conferencing endpoints support point-to-point communication through direct IP-address dialing even when they are not registered with an H.323 gatekeeper or SIP registration server.
In a registered deployment, endpoints can use logical identifiers, such as H.323 numbers or SIP numbers, to establish calls. The associated signaling infrastructure resolves these identifiers and facilitates call routing.
When registration is unavailable, the endpoints can instead establish communication by directly addressing the destination endpoint's IP address.
Option A is correct because successful point-to-point communication does not inherently require registration with a central server, provided that the endpoints support compatible signaling and media capabilities and can communicate over the network.
Huawei's Lab Guide explicitly describes this procedure under Point-to-Point Call (Touch).
The administrator enters the destination endpoint's IP address in the meeting interface and initiates the call.
The endpoint then attempts to establish the connection directly.
The guide further explains that, when the connection fails, engineers should verify network reachability and the accuracy of the destination IP address.
Firewalls, routing restrictions, and incompatible endpoint configurations can still prevent communication even when the addresses are correct.
The central distinction is that server registration enables number-based calling and centralized management, whereas direct IP dialing can support point-to-point calls independently.
Huawei reference: Lab Guide, Section 1.3.1.5, Point-to-Point Call (Touch), PDF pages 25-26; Section
1.3.2.5, Point-to-Point Call (Controller).
問題 #50
Which statement correctly describes the functions of the RTP protocol?
答案：C
解題說明：
Real-time Transport Protocol (RTP) is responsible for transporting time-sensitive media streams, including audio and video, across IP networks.
RTP provides mechanisms such as sequence numbering and timestamps that allow receiving endpoints to identify packet ordering and support the timely reconstruction and playback of real-time media.
Option C is correct because RTP is the protocol used to carry real-time media streams within an established multimedia communication session.
Option A describes the role of Session Description Protocol (SDP). SDP communicates media characteristics and negotiation information, including supported codecs, transport addresses, and media parameters.
Option B describes Session Initiation Protocol (SIP). SIP is responsible for initiating, modifying, and terminating communication sessions through signaling messages.
Option D describes Real-time Transport Control Protocol (RTCP). RTCP works alongside RTP to monitor media-stream transmission characteristics and provide control information, including reception statistics and quality-related feedback.
Huawei's Training Material explicitly distinguishes these protocol responsibilities in its introduction to SIP.
An important technical distinction is that RTP supports real-time delivery mechanisms but does not independently guarantee packet delivery, eliminate network congestion, or ensure a fixed transmission delay.
Overall media quality depends on the network and associated quality-control mechanisms.
Huawei reference: Training Material, PDF pages 93-94, Location of SIP on the Network and Introduction to SIP (1).
問題 #51
Which of the following basic request messages is used to terminate a session?
答案：B
解題說明：
SIP provides different request methods for controlling the lifecycle of multimedia communication sessions.
Each method performs a specific signaling function.
The BYE request terminates an established SIP session. Either participant can initiate a BYE request when the communication must end. After the request is processed successfully, the receiving entity returns a final response, typically 200 OK, completing the session-termination signaling procedure.
Option C is therefore correct.
Option A, CANCEL, terminates a pending request before the associated transaction has completed. It is commonly used to cancel an unanswered call attempt. CANCEL does not terminate an already established session.
Option B, ACK, acknowledges the final response to an INVITE request. Its purpose is to complete the relevant INVITE signaling procedure rather than terminate a session.
Option D, INVITE, initiates a multimedia session or changes an existing session through a subsequent INVITE exchange. It is not the standard method for terminating an established session.
Huawei's Training Material explicitly identifies BYE as the basic SIP request used to release an established call.
The examination distinction is between canceling an incomplete session-establishment attempt and terminating a session that has already been established. CANCEL addresses the former condition, while BYE addresses the latter.
Huawei reference: Training Material, PDF pages 100-101, SIP Requests (1) and SIP Requests (2); PDF page
107, Non-INVITE Transactions.
問題 #52
Which of the following videos offers the smoothest image quality?
答案：B
解題說明：
Video frame rate represents the number of complete image frames displayed every second. It directly influences the perceived smoothness of motion in video conferencing, particularly when participants move quickly or cameras capture dynamic scenes.
Among the specified options, 60 frames per second provides the highest temporal resolution and therefore the smoothest representation of movement, assuming equivalent video quality and stable delivery conditions.
Huawei's Training Material explains that 30 fps provides basic video smoothness, while 60 fps produces smoother motion. Increasing the frame rate reduces the time interval between consecutive frames, allowing viewers to perceive movement with less temporal discontinuity.
Option A, 50 fps, offers smoother motion than conventional 25 fps or 30 fps video but delivers fewer frames per second than 60 fps.
Option C, 25 fps, is sufficient for many conventional video applications, although rapid movement may appear less fluid.
Option D, 30 fps, is widely used in standard video conferencing and provides acceptable smoothness for typical meetings.
Option B is correct because it offers the greatest frame frequency among the alternatives.
Frame rate should not be confused with resolution. Resolution determines spatial image detail, whereas frame rate determines temporal smoothness. High-quality conferencing requires an appropriate balance of both parameters and sufficient network bandwidth.
Huawei reference: Training Material, PDF page 11, Development Trend of Video Communication - Frame Rate.
問題 #53
Assume a user needs to add several SMC conference operator accounts.
On which of the following pages must the user perform this operation?
答案：C
解題說明：
The Huawei Service Management Center separates system administration from routine conference operations through distinct web portals.
The SMC sys-portal is the system management interface. It provides centralized administrative capabilities, including user provisioning, organization management, conference-room provisioning, device administration, and system configuration.
Option A is correct because creating conference operator accounts is an administrative provisioning activity.
An authorized system administrator accesses the SMC system management portal and creates the required conference users.
The Lab Guide describes this process in Experiment 3. After accessing the system management interface, the administrator navigates to Service Provisioning > Organization & User Management > Organization & Conference User, selects the appropriate organization, and adds the required accounts.
Option B is incorrect because the MCU web interface is intended primarily for MCU-specific device configuration and maintenance.
Option C is incorrect because the endpoint Touch interface provides local endpoint configuration and conference operations, not centralized SMC account provisioning.
Option D identifies the SMC conference management portal. Conference administrators and common users use this interface for their authorized conference activities, but account creation is performed through the system management portal.
The fundamental distinction is between provisioning conference-management identities and performing conference-management operations using those identities.
Huawei reference: Lab Guide, Section 3.3, User Management, especially Sections 3.3.3 and 3.3.4, PDF pages 71-77; Training Material, Provisioning a Conference User.
問題 #54
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