H11-861_V2.0 HCIP-Video Conference V2.0 Questions and Answers
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.
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 ( ).
Which of the following protocols belongs to the encapsulated transport protocol ( ).
A short message is one that can send ( ) messages to a designated venue or to all venues for inter-venue communication and information prompting. (Fill in the blanks)
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.
1080P or 720P 50/60fps is a full-frame image of 50 frames per second or 60 frames progressively, rather than an interlaced image of 50/60 fields.
Static NAT converts a private address into an Internet address, and it is many-to-many, and there is no guarantee that a private address will be converted to a public address.
In the Cilent/Server model, the primary function of request proxy server is to decide where to send signaling messages.
The feed can be either the active image or the contents of the computer desktop. ( )
Multicast, is a network technology that allows one or more senders (multicast sources) to send a single packet to the receiver (once, simultaneously).
As shown in the figure, the RTCP instance flow includes SR, RR, and ( ) messages.
Cascade channel usage rules are consumed by priority, and resources are mutually exclusive when at the same priority.
Terminals with built-in mini-McU capabilities can hold multi-point meetings with the built-in MiniMU, but processing power is limited.
PCM coding mainly includes three processes: sampling, quantization, and coding.
In the networking, in which stage of signaling transmission occurs, such as the transmission keep-alive duration, keep-alive port, and keep-alive fields?
During a peer-to-peer number call, the terminal ends up getting the () of the peer terminal from GK and makes the call.
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
What properties does the color rendering index affect on the color of a video image?
The TO tag, the From tag, and the Call-ID together define the peering SIP relationship between UAC and UAS, called a dialog (Dialog)
Reducing reverberation time can be achieved by covering walls, ceilings, windows, and floors with soft finishing materials.
Loudness indicates the strength of the sound, which of the following factors determines the size of the loudness?
The 598.Q.931 protocol is the protocol used for information exchange between the gateway and the gatekeeper, and is primarily responsible for signaling processing during the call.
Under static NAT networking, the SRC address of the terminal under the private network changes to ().
The following description of the advantages and disadvantages of packet loss retransmission ARQ is correct.
For the relationship between photography and reflected light, how to use the reflected light of indoor decoration. ( )
Video conferencing requires a color rendering index greater than ( ) for light sources
The types of terminal faults can be summarized as: local AV faults, remote AV faults, and call and conference control problems.
Multicast is a networking technique that allows one or more senders (multicast sources) to send a single packet to multiple receivers (once, simultaneously).
Which of the following measures can users use to expand the video port of the VP9650 ?
When the MCU cannot connect to the SMC, what can I do to locate the cause of the failure?
In the process of the MCU main control board main standby reversal, the conference and venue status on the SMC will be offline for about 10 seconds.
When the speech codec capability is negotiated in the SIP protocol, the voice codec supported by the local device is provided, including PCMU and PCMA Based on the RTP message shown in the figure, it can be seen that the ( ) voice codec is selected.
SEC2.0 is suitable for network packet loss models that are burst-type packet losses.
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?
Video conferencing has certain requirements for lamps, and the lamps used require strong light efficiency, uniform and soft light, and make full use of diffuse reflection.
Regarding the auxiliary IP of high-definition terminals, the following statement is wrong ( )o
In logical SIP entities, UAS is used to initiate SIP requests and UAC is used to return SIP responses.
In the SMC2.0 system, ( ) has the highest level of user rights. (Fill in the blanks)
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. ( )
In the camera control of the WEB interface, only the local camera can be controlled, not the remote camera. ( )
The three modes of operation of the proxy are: Call Stateful, Stateless, transaction Stateful.
The MCU encodes each terminal image that needs to be added to the multi-screen combination, and when combined into a road image, it is transmitted to all terminals viewing the multi-screen
The original MCU cascade has a cascade channel, which can only transmit one video code stream, and the Zhizhen conference can only transmit the medium-screen image, supporting multi-channel
cascading, each level of MCU Multiple video can be transmitted, and a complete Zhizhen 3-screen image can be transmitted to enhance the experience.
Wireshaik can capture packets of multiple network interface types, with the exception of wireless LAN interfaces.
Banners are used to briefly display meeting content, and subtitles are used to highlight the meeting topic.
The MCU ' s built-in WEB includes multi-user management, address management, conference management, and device management. ( ) When using the MCU wall riding mode, there is no need to add
other public and private network traversal devices. ( )
The FEC forward error correction algorithm is an algorithm that sends redundant data at the sending end and recovers the code stream based on the redundant data at the decoding end.
In the Early state, the caller can terminate the dialog by sending (). (2 answers).
Under the static NAT networking, the packet of the private network terminal through the firewall will change, and the following description is wrong ( ).
The 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
The following description of the relationship between the RTCP port number and the RTP port number is correctly ( ).
In audio coding technology, which of the following is a voice quality metric. ( )
In video conferencing, in order to improve the quality of speech, we can add some voice enhancement technology, such as ( ).
The 245.H.460 protocol specifies that the public-private network traversal processing process for the H.323 media streaming portion is ( ).
In VR scenarios, the terminal cannot join the meeting in the following ways ().
The INFORMATION that the IP header in the SETUP message does not contain Is there? ( )
RRJ sendto [ ( 218.5.64.98:18616 )] [5928509444] [[0x00000065:err reg wrong account or passwork]] From the above logs, you can tell that the reason for the failure of registration is ( ).
From the logs caught above, it can be seen that which of the following is the cause of the call failure?
The following description of the advantages and disadvantages of forward error correction FEC is correctly ( )o
In VR scenarios, the terminal cannot join the meeting ( ) in one of the following ways.
Color temperature affects the reproducibility of the color of the video image, the higher the color temperature, the more color. ( )
On the terminal web page, you can set parameters for subtitles, which include banners, middle captions, and instant messages. Banners and middle captions can be displayed separately or at the same
time; Instant messages can be sent to peer-to-peer private chat, broadcast and sent, or sent at a designated venue.
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. ( )
If both the sender and receiver () are the same, the MCU forwards directly. (3 answers).
Methods of adjusting the horizontal angle include: adjusting the seat when the screen width is fixed; Adjusting the screen width can change the horizontal angle.
The Call-ID header field serves as a unique identifier for a collection of messages, and in a conversation, the Call-id must be the same in all the last requests sent by each UA. ( )
Stretch mode is stretched to a full screen proportional to the output, which captures part of the image. ( )
An MCU can belong to only one service area, but a service area can have multiple MCUs.
A CANCEL transaction can only be received after receiving an ad hoc response from INVITE (including 100 ). The final response is sent before. ( )
In the multi-channel cascade feature, up to 32 cascaded channels between two MCUs in the same meeting.
After the endpoint enables the NAT setting, it can change the packet content and can be used for static NAT networking mode and DNAT/NAPT networking mode.
Each RTP datagram consists of two parts, the header and the payload, where the meaning of the first 12 bytes of the header is fixed , and the payload can be audio or video data.
The chamber sound reaches a stable state during reverberation time, and the residual sound is repeatedly absorbed by the sound absorbing material in the room after the sound stops, and the original value
of the average sound energy density word decays to one part in a million (Acoustic code attenuation 60dB). The time required, expressed in T60.
In multimedia services, RTP is used for real-time datagram transmission and RTCP is used to detect the quality of service for an RTP session.
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.
Cascade channels are used by priority, and resources are mutually exclusive when at the same priority.
Color rendering index refers to the object with the light source illumination and with a standard light source illumination, the degree of its color compliance of the degree of measurement, the smaller the
value indicates the higher degree of conformity. ( )
Non-T.140 subtitles only support sending and receiving subtitles from H.323 type terminals.
When using MCU wall riding mode, the terminal on the GE0 side can call the terminal on the GE1 side over IP.
Mixing is actually mixing the loudest venues except for your own venue, not mixing all the venue sounds.
The role of MP is to complete the interaction of control information with the conference TV terminal.
Fe and GEO, GE1 IP addresses can not be in the same network segment, otherwise it will cause network failure, at this time the front panel ALM light is always on. ( )
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.
Color temperature affects the white balance of the camera, and where the color temperature is complex, the image can be cast.
The gatekeeper ' s address translation function refers to the conversion of farm names or numbers to IP addresses based on the data table at the time of node registration.
Fe and GE0, GE1 IP addresses can not be in the same network segment, otherwise it will cause network failure, at this time the front panel ALM light is always on.
The opening process of the logical channel in the H323 protocol follows the principle of " who transmits, who opens " . ( )
MSDR is the master-slave decision to reject the message, the ability to exchange results that are inconsistent with the settings of this end, then reply to MSDR. ( )
During a point-to-point number call, the called terminal does not send a call request to GK until it receives setup signaling.
Network Address Translation (NAT) is used to enable translation between private network addresses and public network locations.
ALG (Application Layer Gateway) is a monitoring application protocol that modifies the content of the message and opens the corresponding ports.
Multi-channel cascading, mainly through the establishment of multiple cascaded channels between the cascading conferences of the MCU, the multi-channel code stream on the MCU is sent to the peer
MCU.
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)
Video compression includes intra-frame compression (1 frame) and inter-frame compression (P frame), common H.26X, MPEG-2, MPEG-4 Both support in-frame/inter-frame compression.
As can be seen from the figure, the venue can not receive remote venue video in the meeting, what measures can the user take to locate the cause of the failure?
The large amount of data and the existence of data redundancy in the sound signal are the basis for the encoding of digital audio.
The following figure shows the system information for a VP96 Series MCU . From this information, what conclusions can we infer from the following?
When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().
Protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union, which two protocols are mainly composed?
When using the MCU wall riding mode, you need to modify the firewall in the original network (such as open ports).
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.
Which one is wrong with the description of the VP9660 single board LEDs below?
Which of the following is not included in the main functions of the gateway gateway?
Color temperature is the most common indicator of the spectral quality of a light source in Lux (1x).
Users can call the IP address of the MCU, enter the conference lobby, and create a video IVR according to the IVR prompts Of meetings ().
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).
In June 2002, SIP was adopted (), which is the core specification for the SIP protocol.
The RTP protocol provides both real-time transmission capabilities and service quality assurance mechanisms.
Enabling SEC, the system can automatically adjust the network transmission and different error corrections of AV processing for the rich QOS mode of the IP network After enabling SEC, the anti-packet loss ability has been greatly improved ()
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).
The Clear Fluency Strategy works with the H.264H.265 protocol, and if there is no ability in the public capability, the Clear Fluency Strategy will not work. ()
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.
Four metrics, color temperature, illuminance, and color rendering index, are used to measure the effect of conference room lighting, which has an impact on the rendering of video images of the conference.
When two parties have a video conferencing call, a voice stream and a video stream are generated, where the RIP stream contains the voice stream and the RTCP stream contains the video stream.
The principle of the built-in MCU of the terminal is that the terminal with the built-in MCU is connected to each terminal separately.
supports up to 1080I dual-stream, which is the industry ' s highest dual-stream processing capability.
The ( ) function in Wireshark visualizes the conversational communication process graphically.
Which of the following actions will prevent users from dialing the MCU ' s IVR number from the terminal to create a meeting?
The feed can only be displayed on the same monitor as the mainstream, not independently.
Which of the following RSE6500 ether ports is the one that provides recording and broadcasting services?
When an endpoint/MCU calls with a number, the ARQ call information does not include the following () of the following
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