The SR message in TCP is a sending report, which describes the sending and receiving statistics of the sending gateway.
- A . TRUE
- B . FALSE
In multimedia services, RTP is used for real-time data message transmission, and RTCP is used to detect the service quality of RTP sessions.
- A . TRUE
- B . FALSE
The voice enhancement technology Jitter Buffer uses a signal wave of human intervention to eliminate the echo signal generated in the communication process, while retaining other normal voice signals to achieve the normal use of communication.
- A . TRUE
- B . FALSE
Voice enhancement technology, automatic noise suppression ANR can solve the problem of the overall low or high call volume in the line.
- A . TRUE
- B . FALSE
Image format refers to the size or resolution of the image. Commonly used image formats include SOCIF, QCIF, CIF, ACIF, 16CIF, HD and Full HD.
- A . TRUE
- B . FALSE
The video signal starts from the input terminal equipment, encodes and compresses it and sends it to the network, and finally displays it. It has undergone many images processing links in the middle, mainly including: IP camera, preprocessing, compression encoding, data encapsulation and transmission, decoding, Image format changes, playback.
- A . TRUE
- B . FALSE
Full HD image resolution is?
- A . 1408 X 1152
- B . 1920×1080
- C . 1280×720
- D . 704X576
Illuminance, expressed by the luminous flux received per unit area, expressed in lux (Lux, lx).
- A . TRUE
- B . FALSE
The arrangement of lamps and lanterns requires direct illumination to avoid diffuse reflection.
- A . TRUE
- B . FALSE
The color of the desktop should be adjacent to the skin color or gray, and avoid the same color as the skin color, the reflectivity of the desktop should be higher than the skin color to highlight the skin image.
- A . TRUE
- B . FALSE
Loudness indicates the strength of the sound, and which can determine the loudness?
- A . The material of the sounding body
- B . Sound intensity
- C . Amplitude of sound waves
- D . sound frequency
The basic concept of white balance technology is "regardless of any light source, white objects can be restored to white", and the color cast phenomenon that occurs when shooting under a specific light source is compensated by strengthening the corresponding complementary color.
- A . TRUE
- B . FALSE
The stretching mode is full-screen stretching according to the output ratio, and part of the image will be captured.
- A . TRUE
- B . FALSE
The design purpose of the terminal auxiliary IP is to allow users to log in the terminal to configure or debug in the local area network, which can be used for the main business.
- A . TRUE
- B . FALSE
Terminals with built-in mini-MCU function can hold multipoint conferences through the built-in MiniMcU, but the processing capacity will be limited.
- A . TRUE
- B . FALSE
The IP addresses of FE, GEO and GE1 cannot be in the same network segment, otherwise, network failure will occur. At this time, the ALM indicator on the front panel is always on.
- A . TRUE
- B . FALSE
MCU built-in WEB includes multi-user management, address book management, conference management and equipment management.
- A . TRUE
- B . FALSE
When using the MCU wall riding mode, there is no need to add other devices for traversing the public and private networks.
- A . TRUE
- B . FALSE
The network port of the switch connected to the MCU must be: LOOM half-duplex.
- A . TRUE
- B . FALSE
Network recording service During the meeting, in addition to recording the content of the meeting, you can also watch it in real time through the live client.
- A . TRUE
- B . FALSE
The SMC platform, as Huawei’s video conferencing service management platform, manages and schedules video conferences in a unified manner, can realize all conference control operations in video conferences, and provide customers with a convenient and fast conference management experience.
- A . TRUE
- B . FALSE
Forward error correction (FEC), when the two parties establish a call and detect that the media stream packet loss exceeds 0.1% within 10s, the super error correction function will be enabled, and the super borrow correction function will divide a part of the call bandwidth. It is used to transmit redundant code streams that are resistant to packet loss.
- A . TRUE
- B . FALSE
Peer-to-peer network, diagnosis in the case of networking without public and private network traversal.
- A . TRUE
- B . FALSE
The Huawei NLOG software is part of the conference scheduling and management software, and is installed and used together with the SMC conference management software.
- A . TRUE
- B . FALSE
In H.460 networking, the RTP keep-alive code stream is?
- A . Sent from the private network terminal to the public network terminal
- B . The data sent by the public network terminal to the private network terminal
- C . Sent by private network terminal to Ts
- D . Sent by the public network terminal to Ts
Under the static NAT network, which is wrong about the signaling description of the public network terminal calling the private network terminal?
- A . Callee Cs addr is the NAT address
- B . Caller Cs addr is the NAT address
- C . The DST address actually processed by the firewall is the private network terminal address
- D . The DST address of the public network terminal is the NAT address
The basic functions of the firewall include: content filtering, user authentication, VPN, application proxy, NAT, packet filtering & state detection, IDs and alarms, logs, etc.
- A . TRUE
- B . FALSE
According to the H.323 protocol, the signaling required to complete the process of capability exchange is?
- A . DRQ, DCP
- B . MSDR, KSDA
- C . TCSR, TCSA
- D . GRQ, GCF
The Call-ID header field is used as a unique identifier for a series of messages. In the dialog, in all requests and responses sent by each UA, the Call-id must be the same.
- A . TRUE
- B . FALSE
A SIP message consists of a start-line, a header consisting of one or more fields (riold), a blank line (CRLF) that marks the end of the header, and an optional message body (message boby) composition.
- A . TRUE
- B . FALSE
For the SDP protocol, line 0 contains parameters related to the session owner, where the first parameter indicates?
- A . Network Type
- B . Session identifier of the calling party
- C . Address Type
- D . The name of the session initiator
In the Contirmed state, both the calling and the called can terminate the Dialog through ByE.
- A . TRUE
- B . FALSE
The branch parameter of the CANCEL transaction is the same as the INVITE.
- A . TRUE
- B . FALSE
RTP runs on (), and each RTP message is encapsulated in a () datagram.
- A . OTCP, TCP
- B . OUDP, TCP
- C . OTCP, UDP
- D . UDP. UDP
The illuminance is based on the luminous flux received by the vertical plane. If it is irradiated obliquely, the illuminance will decrease.
- A . TRUE
- B . FALSE
The color rendering index refers to the measure of the degree of color conformity of an object when illuminated by this light source and by a standard light source. The smaller the value, the higher the conformity degree.
- A . TRUE
- B . FALSE
Huawei’s video product fault location methods can be summarized as follows: food and grass first, follow the vines, step by step, bold and careful, and pass on the fire from generation to generation.
- A . TRUE
- B . FALSE
A firewall protects a network from attacks by "untrusted" networks, but must also allow legitimate communication between the two networks.
- A . TRUE
- B . FALSE
Among the four elements of packet filtering by the firewall, the conditions that can generally be omitted are?
- A . Destination port
- B . Source Port
- C . Destination address
- D . Source address
In H.460 networking, what is the code stream hole between the public network and private network terminals maintained?
- A . Timed keep alive package
- B . Tunnel
- C . IRQ heartbeat message
- D . No need to maintain, the stream channel is established after the hole is opened
Which of the following messages is not a status query message?
- A . IRQ
- B . RRQ
- C . IACK
- D . IRR
When 2 MCU are cascaded, a conference is scheduled, and the upper and lower MCU join the conference as a virtual conference site respectively.
- A . TRUE
- B . FALSE
Response message "lxx", indicating?
- A . Indicates that the request message contains a syntax error or the SIP server cannot complete the processing of the request message
- B . Further action shall be taken to complete the request
- C . Indicates that the request cannot be fulfilled on any SIP server
- D . Indicates that the request message has been received and is being processed
The SIP protocol, the Session Initiation Protocol, is used to establish, control and release sessions.
- A . TRUE
- B . FALSE
SDP is a text-based protocol for media type, encoding scheme, address negotiation, etc. during session establishment.
- A . TRUE
- B . FALSE
CANCEL transaction can only be sent after a provisional response to an INVITE (including 100) is received before the final response.
- A . TRUE
- B . FALSE
For the SDP protocol, line c contains information on the connection established for the multimedia session, which indicates the IP address used by the actual media stream.
- A . TRUE
- B . FALSE
Color temperature is the most common indicator of the spectral quality of a light source, and the unit is Lux (lx).
- A . TRUE
- B . FALSE
The intelligent control system includes video system, audio system and others. Which of the following is not a video system?
- A . Video Input System
- B . Pickup System
- C . Lighting system
- D . Video Display System
The final effect of a video conference is only related to the conference equipment itself, and has little to do with the integrated environment of various peripherals in the conference room.
- A . TRUE
- B . FALSE
Colors with opposite ends of any diameter of the color wheel are called complementary colors.
- A . TRUE
- B . FALSE
The signal flow of the audio loop is?
- A . Microphone->Audio Input->Audio Output->Speaker
- B . Audio Output->Audio Input->Speaker->Microphone
- C . Microphone->Audio Output->Audio Input->Speaker
- D . Speaker Audio Input -> Audio Output -> Microphone
The core of NAT mapping is to modify the destination address of the datagram header.
- A . TRUE
- B . FALSE
What is the reason for the call failure can be seen from the logs captured above?
- A . The callee is busy
- B . Insufficient call bandwidth
- C . Failed to negotiate capabilities
- D . The callee is offline
GK must support BRQ, BCF r BRJ messages and accept all bandwidth modification requests.
- A . TRUE
- B . FALSE
The opening process of the logical channel in the H323 protocol follows the principle of "whoever transmits, whoever opens it".
- A . TRUE
- B . FALSE
The single value in the header field can only appear once in the message, such as Via, Route, etc.
- A . TRUE
- B . FALSE
SDP (Session Description Protocol) is a transport layer control protocol used to describe multimedia sessions.
- A . TRUE
- B . FALSE
For the SDP protocol, the m line is also called the media line, which describes the information such as the media type supported by the sender, and the second parameter is?
- A . Transmission Protocol
- B . Media name
- C . Number of four payload types supported
- D . Port number
Among the six basic request messages, () is used to query server capabilities.
- A . OPTIONS
- B . INVITE
- C . REGISTER
- D . ACK