H11-861_V2.0 Practice Exam Questions and Answers

T.140 Subtitles support sending and receiving subtitles from SIP, H.323 type terminals.

Color temperature affects the white balance of the camera, and where the color temperature is complex, the image can be cast.

Message is the basic unit of the SIP protocol, the basic unit of interaction between the client and server sides

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 ( )

ALG (Application Layer Gateway) is a monitoring application protocol that modifies the content of the message and opens the corresponding ports.

GK supports the resolution of the called number to the neighbor GK when the called node belongs to the neighbor GK area based on the called number.

TCs are capability exchange requests that inform the peer of the capability information ( ).

The mcu wall riding mode requires modifications to the firewall in the original network ( such as open ports ).

AN INVITE transaction consists of a three-way handshake. The client transaction sends INVITE, the server transaction sends the response, and the client transaction sends an ACK, ( ).

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. ( )

Ways to improve architectural acoustics include ( ). (Select 3 answers).

The processing process of audio signal from input to playback mainly includes: analog audio signal input, sampling quantization/encoding, playback, decoding, transmission/ Storage.

The video signal starts from the input terminal device, is encoded and compressed and sent to the network, and finally displays, and has undergone many image processing links in the middle, mainly

including: IP Camera, pre-processing, compression encoding, data encapsulation and transmission, decoding, image format variation , broadcast. ( )

Dialogs can be divided into INVITE transactions and non-INVITE transactions, where the INVITE transaction in turn includes a request message and a response message.

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)

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. ( )

VR can be understood as an interactive way to guide users to a destination meeting or create a meeting. ( )

The conference will not have a terminal when MCU is active and standby.

A CANCEL transaction can only be received after receiving an ad hoc response from INVITE (including 100 ). The final response is sent before. ( )

During a point-to-point number call, GK receives two call requests.

Where the illumination is not enough, the image noise is low, and the image is dark.

GK can have only one prefix.

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.

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.

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.

SIP is an application layer protocol that is independent of the transport layer protocols below and can be hosted on different transport protocols, such as UDP/TCP/TLS/SCTP, currently Most commonly used

TCP. ( )

Only one P frame is sent at the beginning of the build during the call, and the subsequent video images are encoded using I frames.

Multicast, is a network technology that allows one or more senders (multicast sources) to send a single packet to the receiver (once, simultaneously).

Call acceptance, which is used by the terminal to request the validity certificate of the call from GK and the address and bandwidth information of the caller. ( )

The SIP protocol is the session initiation protocol for establishing, controlling, and releasing sessions. ( )

When using the MCU wall riding mode, there is no need to add other devices traversed by public and private networks. ( )

In the process of processing the video signal of the video terminal, the chip is responsible for encoding and compression. (Please fill in the English abbreviations).

ALG can only be used with certain firewalls.

PCM coding mainly includes three processes: sampling, quantization, and coding. ()

Terminals with built-in mini-McU capabilities can hold multi-point meetings with the built-in MiniMU, but processing power is limited.

On N1og's F1ash graphical interface, we can check the network status of the terminal by checking different data types, such as checking NRJ, the interface will show the jitter of the current terminal receiving packets. Then, by checking the box, you can see the packet loss rate of the demo code stream received by the terminal. (Please fill in the English abbreviations)/

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.

In a multipoint meeting, users can initiate an operation that deprives the demo token from any venue.

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.

Which of the following layers does RAS host?

Video compression includes intra-frame compression (I frame) and inter-frame compression (P frame), common H.26X, MPEG-2, MPEG-4 Both support in-frame/inter-frame compression.

What does the RSE6500 offer?

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.

What are the following ways to improve building acoustics?

GK can have only one prefix.

The main advantages of AAC-LD audio encoding are: low bandwidth, low latency, and high quality. ()

Which of the following values does the color rendering index required for video conferencing light sources need to be greater than?

Three-color lamp refers to the use of red, yellow, blue three color spectrum of the lamp and light emitting lamps, the general luminous color and the color temperature of the lamp has a relationship, with a soft luminous light, uniform brightness, no stroboscopic, high visibility, small power consumption, high voltage resistance, no electric heat disaster characteristics.

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.

Due to the size of the display and the resource limitations of the MCU , the number of multi-screen sprites generally does not exceed 24 , otherwise the image is too small and the picture will not be clear.

The following description of the standalone SC ride wall networking configuration, which one is wrong?

The multi-channel cascade feature requires that the video protocol of all multi-channel venues be consistent, and the bandwidth can be different. ()

Which of the following is not a disadvantage of forward error correction?

Adhoc Conferencing is a conferencing mode that allows you to create and join a meeting on the terminal side without an administrator.

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?

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 H323 protocol ends up with the number 3 denoting ( ).

What are the correct items in the following description of the SIP protocol?

The basic functions of the firewall include: content filtering, user authentication, VPN, Application Proxy, NAT, packet filtering & state detection, IDS and alarms, logs, etc.

In the SIP protocol, when the response message is "1xx", it means that the request message has been received and is being processed.

H.460 In the network, the SETUP connection of the private network terminal is

MP mainly completes those functions () later. (2 answers).

The most fundamental difference between the human voice is ( ).

H.460 In networking, the communication between the terminal and the clientGK follows the protocol ( ).

Dynamic dual-streaming, following the ( ) standard.

MCU In Wall Riding mode, () needs to be registered with GK.

Under static NAT networking, the signaling description of the public network terminal calling the private network terminal is wrong? ( )

Which signaling does it mainly include?

At DVI output, the 9039S and 9039A can support a primary and secondary input resolution of 1080P 60fps, in which case the secondary can reach ( ). The resolution of .

The following description of the H.323 call flow is correct

The INFORMATION that the IP header in the SETUP message does not contain Is there? ( )

Under static NAT networking, the SRC address of the terminal under the private network changes to ().

Regarding the Client proxy in the H.460 protocol, the following description is correct ( ).

INVITE transactions are retransmitted by default at ( ) intervals.

Under static NAT networking, the signaling description of the public network terminal calling the private network terminal is correctly ( ).

The MCU node number after the meeting, consisting of ( ).

In multi-channel cascading, the upper and lower MCU multichannels use the preference of ( ).

Which of the following layers belongs to the mixing strategy (3 answers).

The default mode of operation for the GE1 port of the MCU is ( ).

If both the sender and receiver ( ) are the same, mcus is forwarded.

Under the video service, the public network call private network is not accessible, and the public and private network traversal technology used is generally the same as the private network call public network

The VP9650 MCU has a height of ( )U , with a total of ( ) slots.

Which of the following is part of the conference room design ( ).

Under the static NAT networking, the packet of the private network terminal through the firewall will change, and the following description is wrong ( ).

In the Early state, dialog can be terminated by (). (3 answers).

HD terminals support ( ) this type of 4:3 output.

RAS performs administrative functions, the main content of which includes ( ).

The software format for HD video terminal upgrades is ( ).

Which of the following belongs to the extension request ( ).