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Several video compression standards that are currently widely used include: H.261H.263 and H.264 and MPEG-1. MPEG-2 and MPEG-4. Its H.26X series of standards is primarily used for real-time video
communications, and the MPEG series of standards is primarily used for video storage (DVD), video broadcasting, and video streaming.
Banners are used to briefly display meeting content, and subtitles are used to highlight the meeting topic.
Network recording can record the audio and video output of any venue in the video conference (voice, SD/HD/Zhizhen) and play it back on demand via web.
Background lighting can improve monotonous backgrounds; The background light should be dimmer than the main light to highlight the human image and create a sense of depth. ( )
The working principle of peer-to-peer calls under different GKs is that when GK resolves that the called node belongs to the neighbor GK area according to the called number, GK supports requesting the neighbor GK to resolve the called number, neighbor After GK resolution is successful, the 1P address of the called node is returned to GK, and then GK returns the IP address of the called node to the calling node. Enables a call to be established between the calling node and the called node.
In multi-channel cascading, the upper and lower MCU multichannels use the preference of ( ).
H.460 The envelope in the media streaming interconnection scheme is created by which of the following protocols is established. ()
A short message is when a message ( ) can be sent to a designated venue or to all venues for inter-venue communication and information prompting.
SEC: Super Error Concealment is an anti-packet loss technique using the ARQ algorithm.
H.460 In a networking network, the SETUP connection of the private network terminal is ().
At the end of the meeting, the recording server returns the recording address to the SMC, and the SMC emails the user to watch on demand.
Any SIP message consists of a starting line, a header field, and a message body, and the header domain must end with CFLF (Carriage Return Line Feed).
For the SDP protocol, line c contains information about the connection established for a multimedia session, which indicates the IP address used by the real media stream . ( )
Call Setup Signaling SETUP refers to a message sent by the caller to the called, indicating that the call is wanted to be established.
To use NLOG properly, the FLASH plug-in must be installed or it cannot be used.
The color temperature is defined by the absolute black body, the radiation of the light source in the visible region and the radiation of the absolute black body are exactly the same, at this time the Kelvin
temperature of the black body is called the color temperature of this light source. ( )
As Huawei's video service management platform, SMC platform manages and schedules video conferencing in a unified manner. It can realize all the meeting control operations in the video conference, and can provide customers with a convenient and fast conference management experience.
The role of RTP in VoIP mainly includes: real-time transmission of media information, elimination of jitter, card performance, prevention of packet loss, in a certain situation can be transmitted DTMF signals,
tones and signaling.
Cascade channels are used by priority, and resources are mutually exclusive when at the same priority.
In an RTP packet, the initial value of the Sequence number is random, no RTP packet is sent, and the sequence number is incremented. The receiver detects packet loss and rebuilds packets based on it.
The difference between Ad Hoc conferencing and traditional video conferencing systems is that you can create and join meetings on the terminal side without an administrator.
According to H. 323t, the signaling required to complete the process of exchanging capabilities is. ( )
The basic concept of white balance technology is that "white objects can be reduced to white regardless of any light source", which is a case for color casts that occur when shooting under a specific light
source Compensation is made by reinforcing the corresponding complementary colors. ( )
The alarm light on the MCU dashboard is red and the meeting is scheduled to prompt "License resources are insufficient", possibly because of the MCU The license does not match the actual hardware
configuration of the MCU.
In the Contirmed state, both the caller and the caller can end dialog through ByE. ( )
T.140 Subtitles support sending and receiving subtitles from SIP, H.323 type terminals.
Of the six basic request messages, ( ) are used to query the server capabilities
The SIP protocol's flexible scaling mechanism refers to the addition of header domains and message types.
MsDA is the master-slave decision response message, which carries the Master or Slave flag, which refers to the state of the local side.
Under the static NAT networking, the packet of the private network terminal through the firewall will change, and the following description is wrong ( ).
TCs are capability exchange requests that inform the peer of the capability information ( ).
Huawei NLOG software is part of the conference scheduling and management software, and is installed and used together with the SMC conference management software. ( )
Multicast, is a network technology that allows one or more senders (multicast sources) to send a single packet to the receiver (once, simultaneously).
The function of the redirect server is to map the addresses in the request to zero or more new addresses, which are returned to the client.
In the multi-channel cascade feature, up to 32 cascaded channels between two MCUs in the same meeting.
The terminal auxiliary IP is designed so that users can log in to the terminal configuration or debugging in the LAN, which can be used for main business. ( )
In the default configuration of the firewall, traffic from a high-security network (intranet) to a low-security network (Internet) is generally not restricted, otherwise the firewall blocks.
H.323 defines the H.323 Gateway GateKeeper, Multipoint Processor (MP), but does not define the Multipoint Conferencing Control Unit (MCU).
Cascading between MiniMCU, the default caller will be the primary MCU and the MiniMC that is already the primary MCU will be called It will not be changed again during the meeting. ( )
The ARQ carries information about the node itself (IP address and port number), as well as information about the hard-called terminal (terminal number) and ( )
The following description of the advantages and disadvantages of forward error correction FEC is correctly ( )o
WEB When managing must, in the Export item under the device management interface, the following cannot be exported. ( )
The private network terminal does not enable NAT, and the public network terminal calls the private network terminal inside the firewall to fail, and the root cause is ( ).
The gatekeeper rejects the access authentication, address resolution request, and gives the resolution result, which of the following signaling can achieve this function
Under the video service, for public network calls to the private network can be changed to private network calls to the public network, the public and private network traversal technology used is generally ( ).
(2 answers).
H.460 In the media streaming interconnection scheme, the preservation package is created by which of the protocols listed below ( ).
Regarding the auxiliary IP of high-definition terminals, the following statement is wrong ( )o
The opening process of the logical channel in the H323 protocol follows the principle of "who transmits, who opens". ( )
Huawei's video product fault location method can be mainly summarized as, grain and grass first, follow the vine to touch the melon, step by step, bold and careful, and pass on the torch. ( )
is a general multimedia communication control protocol, mainly for conference communication design, H.323 system using H.245 protocol as a control protocol, for the establishment, maintenance and release of control channels.
Small A found that the image is not clear and the overall image is dark when holding a video conference, please analyze it in combination with the optical principles of video conference construction, which of the following is the most likely cause?
Which of the following protocols is used to propagate the stream between the MCU and the network recording server?
In a networking network, the H.245 TCP connection of the private network terminal is established with TS.
08:08:01 ARJ sendto[(61.131.13.141:1719)][Caller][59512724][(61.131.13.141:
1720)][Callee][59522000051][[Oxoooo006d:err.cal1 callee_offline)] From the logs caught above, which of the following is the cause of the call failure?
Private network HD terminals use static NAT for public and private network crossing, regarding the calls between terminals, the following statement is incorrect ().
During the terminal registration GK phase, the UDP header in the RRQ registration request message contains the following information ( ).
In the SMC2.0 system, which of the following user rights has the highest level.
The 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
Video conferencing requires a color rendering index greater than ( ) for light sources
RAS performs administrative functions, the main content of which includes ( ).
The 310.H.460 protocol specifies that the public-private network traversal of the signaling portion is handled by ( ).
In the RTP specification (RFC3550), a total of ( ) types of RTCP reports are defined to report current control information.
The code flow hole from the public network to the private network is opened by the redirect message of the RTP, through what to maintain? ( )
In the registration signaling process, the terminal initiates to GK which of the following messages represents a registration request ( ).
In video conferencing, the empty field noise is required not to be greater than ( ).
The () phenomenon occurs in a conference when the microphone is used at the same time as the speaker and the sound system emits sound that can be collected by the microphone.
The following description of the relationship between the RTCP port number and the RTP port number is correct ().
Which of the following ways does HD terminal support to initiate peer-to-peer calls?
For reverberation, the pickup is dominated by a direct sound, and the appropriate amount of reverberation sounds thicker, and it is recommended that the pickup direct sound be around 90%. However, the reverberation sound after 50ms will affect the language comprehensibility, and it is recommended that the sound energy reached within 50ms accounts for more than 80%.
What is the range of empty field noise requirements in the acoustic key indicators?
In an RTP message, Timestamp reflects the sampling moment of the first bit in the RIP packet. The instantaneous accuracy of sampling must meet the synchronization requirements for synchronization and jitter calculations. The starting value of the time flag is random and will be incremented with the size of the message data.
Video conference room integration refers to the end-to-end solution () that uses corresponding equipment to meet the user's requirements for various scenarios in the conference room in accordance with certain design principles in the construction of the conference room
gateway is a node that provides real-time two-way traffic between the H.323 terminal on the SCN and other nodes on the PBN.
When the terminal enables the remote monitoring function, the user can remotely monitor the main video image or presentation image of the end in the Web interface, and can also take photos to save, but can not view the mainstream image or presentation image of the remote end.
The protocol can be used for public-private network traversal of devices that support the H.323 protocol. (Please fill in the type of agreement).
Which of the following describes a policy that is not part of MCU audio mixing?
When the Huawei video terminal is successfully connected to the camera, the user can set the camera parameters through the web interface of the terminal, such as exposure mode, white balance mode, noise reduction, etc., where the larger the noise reduction value setting, the less noise in the picture and the clearer the details of the image.
Adhoc Conferencing is a conferencing mode that allows you to create and join a meeting on the terminal side without an administrator.
In a multipoint meeting, users can initiate an operation that deprives the demo token from any venue.
At present, the sampling method mainly used in video communication: 4:2:0 sampling method ().
RTP is a real-time transmission control protocol: on multicast (multicast) or unicast (unicast) network services, provides end-to-end network transmission capabilities, suitable for applications to transmit real-time data, such as audio, video or simulation data.
In the figure, select an attribute of the packet, right-click and select the option within the ( ) group to specify this attribute as a filter condition, which must be clicked apply before it takes effect.
Which of the following RSE6500 ether ports is the one that provides recording and broadcasting services?
The frame does not have complete picture data, only data that differs from the previous frame.
Enter the ( ) filter condition in the Wireshark Display Filter box to display only H.245 protocol-related messages.
The video signal starts from the input terminal equipment, is sent to the network after encoding and compression, and finally displays, and has gone through many image processing links in the middle, mainly including: IP camera signal acquisition, pre-processing, compression encoding, data packaging and transmission, decoding, image format changes, playback.
The feature of the MCU can be used to bypass firewalls to resolve multimedia communication between end devices in two different network segments.
In the Huawei Recording solution, administrators can convert on-demand pending and on-demand published AP4 format videos to which of the following formats for users to download?
When using the MCU wall riding mode, you need to modify the firewall in the original network (such as open ports).
During the meeting, in addition to recording the meeting content, the web recording service can also watch the meeting in real time through the live broadcast client.
The following description of the auxiliary IP of hd terminals, which one is wrong?
Users can call a conference access number and then create a video conference based on the IVR prompts.
The large amount of data and the existence of data redundancy in the sound signal are the basis for the encoding of digital audio.
Conversations are uniquely identified by Cal1-ID, From Tag, To Tag, and can be modified after they are created.
When GK agrees to a terminal's registration request, which of the following response messages is sent?
When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
When using the MCU wall riding mode, there is no need to add other devices traversed by public and private networks. ( )
After the video terminals A and B join the same video conference, the user of terminal B reflects that the video image of terminal A is more continuous, but not clear enough, and the administrator of terminal A performs the video self-ring and finds that the image of the self-ring is clear. From this, we can infer that the cause of this phenomenon is caused by the high image rate set by terminal A.
Huawei VUE Exam Instructions: 1 The exam randomly draws 60 questions, with a score of 1000, and can be passed by 600;2 After the question bank is all mastered, you can make an appointment for the exam, and the day before the exam, you can make an appointment at the nearest test center; 3. The test question types are single choice and multiple choice, judgment, fill in the blanks, drag charts, and the questions will not tell single choice or multiple choice
You can tell by the options: the radio option is preceded by "Circle", the multi-select option is preceded by "Box"; 4 Exam questions and options are randomly out of order; 5 Documents: ID Card + (Student ID Work Card Credit Card Social Security Card Passport) One of the two documents in total 6. Arrive at the test room 10 minutes in advance (if you encounter special circumstances, you can contact the test room if you are late).
ZTE VUE Exam Instructions:
1. The exam randomly selects 60 questions, with a full score of 100 points, and can be passed by the exam 60 points; (some exams pass 80 points: for example, ZTE service specifications) 2 The question bank is all palmed
After holding the exam, you can make an appointment for the nearest test center the day before the exam; 3. The test question types are single choice, judgment, and multiple choice, each with 20 questions; 4 The order of the exam questions is single choice, multiple choice, judgment; the options are randomly out of order; 5 ID: ID 6 Arrive at the test room 10 minutes early (if you are late in case of special circumstances, you can contact the test room).
Capability Negotiation is primarily used to declare the ability to receive and send supported by this side. Declare the preferred capability set at this end, and the other party needs to prioritize the use of this capability set.
The TO tag, the From tag, and the Call-ID together define the peering SIP relationship between UAC and UAS, called a dialog (Dialog)
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
The frequency response capacity of nature that the human ear can perceive can reach 20Hz-20KHz, using audio standards such as G.711, G.722, G.728, and the audio width is only available 50Hz-7KHz, so use AAC-LD method to solve this problem in high-definition video communication.
In the specification for RTP (RFC 3550), a total of () RTCP reports are defined as used to report current control information. (Fill in the blanks)
The wall riding scheme is a simple public and private network crossing method, which connects different network ports of the MCU in different networks to realize the terminals in different networks to access
the same conference.
In multimedia services, RTP is used for real-time data packet transmission, and RTCP is used to detect the quality of service of an RTP session. ( )
RAS messages are a type of message specified in the H.225.0 protocol, which is a protocol used between nodes and gateways to perform management functions, mainly including registration, access
control, and status.
Forward error correction FEC, when both parties establish a call and detect more than 0.1% of the media stream loss within 10s, the super error correction function is enabled , super loan correction
function, will be a part of the call bandwidth, used to transmit anti-packet loss of redundant code stream. ( )
The mcu wall riding mode requires modifications to the firewall in the original network ( such as open ports ).
Due to the size of the display and the limitation of MCU resources, the number of multi-screen sprites generally does not exceed 16 sprites, otherwise the image is too small and the picture will not be clear.
H. 225 is used for media channel control, including call signaling (Q. 931), and RAS messages between nodes and GKs. ( )
During a point-to-point number call, the called terminal does not send a call request to GK until it receives setup signaling.
If both the sender and receiver () are the same, the MCU forwards directly. (3 answers).
Image format refers to the size or resolution size of the image, common image formats include, SOCIF, QCIF, CIF, ACIF, 16CIF, HD, Full HD. ( )
The RTCP protocol can be freely controlled by SDES grouping, with RTCP SDES marking members away from the session, or members changing SSRC.
RTP is a real-time transmission control protocol: on a network service of multicast (multicast) or unicast (unicast). Provides end-to-end network transmission capabilities for applications to transmit real-time
data such as audio, video or simulation data.
Diagnosis of peer-to-peer networks without networking traversed by public and private networks. ( )
H.323 gateway refers to a node that provides real-time two-way traffic between the H.323 terminal on the SCN and other nodes on the PBN.
Wireshark can not only monitor the network, but also process network data. ( )
TESTED 21 Nov 2024
