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Question # 4

Loudness indicates the strength of the sound, ( ) determines the size of the loudness.

A.

Material of the vocal body

B.

Sound intensity

C.

Amplitude of sound waves

D.

Sound frequency

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Question # 5

What is the role of the RTCP protocol. ( )

A.

Ability set

B.

Transmission Control

C.

Streaming

D.

Call signaling

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Question # 6

H.225 contains which of the following signalings (). (2 answers).

A.

Q.931

B.

H.281

C.

RAS

D.

T.120

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Question # 7

In the MCU Web page, the format of the exported address book information is ( ).

A.

vcf

B.

xml

C.

dat

D.

cap

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Question # 8

H.245 The main signaling consists of ( ).

A.

Capacity Negotiation

B.

The Master-Slave decides

C.

Call request

D.

Open/Close Logical Channel

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Question # 9

Which of the following belongs to the extension request (). (3 answers).

A.

MESSAGE

B.

PUBLISH

C.

OPTIONS

D.

NOTIFY

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Question # 10

MSDR is the master-slave decision to reject the message, when the result of the ability to exchange is inconsistent with the settings on this end, then reply to the MSDR

A.

True

B.

False

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Question # 11

In video conferencing, in order to improve the quality of speech, we can add some voice enhancement technology, such as ( ).

A.

VAD

B.

CNG

C.

AAC-LD

D.

EC

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Question # 12

Which of the following messages indicates that the SIP server failure could not complete the processing of the correct message. ( )

A.

6xx

B.

5xx

C.

lxx

D.

3xx

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Question # 13

For the relationship between photography and reflected light, how to use the reflected light of indoor decoration. ( )

A.

If the reflected light is too small, the direct light of the lamp causes a thick shadow, which will seriously affect the camera effect.

B.

If too much light is reflected, it will increase the illuminance of the display.

C.

Back to a large area of colored decoration will change the color temperature of the reflected light, resulting in a colored shadow

D.

If the mouth reflects too little light, it will increase the illuminance of the display.

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Question # 14

The color rendering index affects the color of the video image. ( )

A.

Color temperature

B.

Reductive

C.

Saturation

D.

Brightness

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Question # 15

Full HD image resolution is. ( )

A.

1408 X 1152

B.

1920x1080

C.

1280x720

D.

704X576

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Question # 16

VGA output is supported up to ( ) resolution.

A.

1366*768

B.

1280*1024

C.

1920*1080

D.

1360*768

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Question # 17

On top of UDP, the H.323 protocol is divided into (). (3 answers).

A.

Terminal Control

B.

Media Control

C.

Data Application

D.

Bandwidth Control

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Question # 18

The following description of the relationship between the RTCP port number and the RTP port number is correctly ( ).

A.

RTCP Side Slogan 2 RTP Port Number+2

B.

RTCP Side Slogan 2 RTP Port Number +1

C.

RTCP Side Slogan 2 RTP Port number -1

D.

RTCP port number twoRTP port number

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Question # 19

In 230.H.460 networking, what protocol does the tunnel between the terminal and the client GK follow? ()

A.

H.460

B.

H.323

C.

H.460.18/19

D.

Q.931

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Question # 20

Which of the following is a mixing strategy ( ).

A.

Mix only a few of the loud ones to avoid slurring

B.

Mix only a few small sounds to avoid muffled

C.

The control sound is not sent to a certain terminal

D.

Control does not process the sound answer received from a terminal

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Question # 21

Which of the following features does the gatekeeper provide (3 answers).

A.

Address Translation

B.

Access Control

C.

Bandwidth Control

D.

Conference Control

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Question # 22

Which of the following protocols belongs to the encapsulated transport protocol ( ).

A.

RTP

B.

RSVP

C.

RTSP

D.

SIP

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Question # 23

The 310.H.460 protocol specifies that the public-private network traversal of the signaling portion is handled by ( ).

A.

H.323

B.

H.460.19

C.

H.460.20

D.

H.460.21

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Question # 24

Wireshark can support decoding of many protocols, such as ( ).

A.

H.263

B.

ip

C.

RTP

D.

TCP

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Question # 25

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

A.

Video Protocol

B.

format

C.

Type

D.

Wide

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Question # 26

The system uses the H.245 protocol as the control protocol for controlling the communication channel. ( )

A.

establish

B.

Bandwidth limit

C.

release

D.

Maintenance

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Question # 27

The environment of the display area requires low illumination, and the reasons for the lower illumination required at the digital projection screen are ( ).

A.

If the ambient light is too bright and the pupil is constricted, there will be a difference in the display of black and white pixels

B.

If the ambient light is too dim and the pupil is constricted, the black and white pixel display will show a difference

C.

Counting casts use white screens, and in order to get enough dark black pixels, a lower ambient illumination

D.

is required The number of shots uses a white screen, and in order to get enough black pixels, a lower ambient illumination answer is required

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Question # 28

Which of the following signaling messages are capable of exchanging?

A.

TCSR

B.

TCS

C.

TCSA

D.

IRR

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Question # 29

HD terminal video output layout mode can be set to ( ) display mode.

A.

Split-screen

B.

Split-screen

C.

Triple-screen

D.

Quad-screen

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Question # 30

H.460 The envelope in the media streaming interconnection scheme is created by which of the following protocols is established. ()

A.

Q.931

B.

H.460.18

C.

H.460.19

D.

H.225.0

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Question # 31

Which one is wrong with the description of the VP9660 single board LEDs below?

A.

The following description of the VP9660 veneer LED, which one is wrong?

B.

Run indicator status is green solid on, indicating that the single board is running normally

C.

GE/FE the network port indicator status is green and constantly off, indicating that the network port connection is abnormal

D.

The ACT LED status is solid green, indicating that the veneer is the main board

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Question # 32

The H460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of (). (2 answers).

A.

H460.17

B.

H460.18

C.

H460.19

D.

H460.20

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Question # 33

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.

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Question # 34

The bunch parameter for a CANCEL transaction is the same as INVITE.

A.

True

B.

False

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Question # 35

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

A.

The IP protocol uses a distributed architecture

B.

SIP is a protocol developed by IETF for multimedia sessions

C.

SIP is an application layer protocol

D.

SIP is a transport layer protocol

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Question # 36

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.

A.

True

B.

False

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Question # 37

Which of the following descriptions of the SIP protocol is correct?

A.

Used to transmit voice packet

B.

can be transmitted over

C.

TCP is a transport layer protocol

D.

Cannot transmit answers on UDP

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Question # 38

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

A.

True

B.

False

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Question # 39

By viewing the system information of Huawei terminals, we can view specifications such as voice, image, interface, and bandwidth.

A.

True

B.

False

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Question # 40

The ( ) function in Wireshark visualizes the conversational communication process graphically.

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Question # 41

Header domains carry the properties of SIP entities, message bodies, and so on.

A.

True

B.

False

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Question # 42

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

A.

True

B.

False

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Question # 43

If the meeting scheduled by the user is not held on time, which of the following measures can be taken to solve this problem?

A.

Check the GK registration of the endpoint and MCU

B.

Check and modify the device system time

C.

on the MCU's web interface Check and modify the terminal time

D.

Change the service area answer for the MCU

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Question # 44

GK When the called node belongs to the neighbor GK region based on the called number, GK supports the request to the neighbor GK to resolve the called number.

A.

True

B.

False

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Question # 45

Adhoc meetings are instant meetings, users can activate the meeting and join the meeting on the terminal side, and the operation process has video and audio prompts.

A.

True

B.

False

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Question # 46

What are the correct items for the following description of the performance of the RSE6500 product?

A.

Supports up to 30-channel meeting HD recording

B.

Smooth scaling can be achieved by adding Licenses

C.

Supports up to 20 HD live streams

D.

Supports up to 2000 web-on-demand

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Question # 47

mode, communication between public and private network devices is supported, and data does not need to go through a firewall.

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Question # 48

protocol for remote camera control ().

A.

True

B.

False

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Question # 49

In the hierarchical relationship of SIP structure, what are the following main items of the request message?

A.

Non-INVIT transaction

B.

Request line/Response line

C.

header field

D.

Message Body

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Question # 50

The test can display 7 color bars on the screen to detect the effect of the picture output.

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Question # 51

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.

A.

True

B.

False

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Question # 52

What is the range of empty field noise requirements in the acoustic key indicators?

A.

Less than or equal to 50dB

B.

Less than or equal to 60dB

C.

Less than or equal to 40dB

D.

Less than or equal to 30dB

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Question # 53

A rackmount MCU can have two main control boards, support master-standby switching, and only need to configure one IP address.

A.

True

B.

False

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Question # 54

In any viewing mode, the venue can be viewed at any other venue.

A.

True

B.

False

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Question # 55

What factors does the quality of digital audio depend on?

A.

Quantize the number of bits

B.

Bandwidth

C.

Sampling frequency

D.

Number of channels

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Question # 56

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.

A.

True

B.

False

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Question # 57

What are the following ways to improve building acoustics?

A.

Low controllable noise

B.

Low background noise

C.

Low stair noise

D.

Low reverberation time

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Question # 58

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 ()

A.

True

B.

False

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Question # 59

When the MCU cannot connect to the SMC, what can I do to locate the cause of the failure?

A.

View the connection parameters for the SMC on the MCU's web interface

B.

Check the MCU network port

C.

Use "ping" to verify MCU and SMC network connectivity

D.

View the answer to the registration parameters for Sc on the MCU's web interface

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Question # 60

The feature of the MCU can be used to bypass firewalls to resolve multimedia communication between end devices in two different network segments.

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Question # 61

The terminal reads the camera data by ( ). (Fill in the blanks)

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Question # 62

A meeting can support up to ( ) group multi-screen. (Fill in the blanks)

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Question # 63

Non-T.140 subtitles only support sending and receiving subtitles from H.323 type terminals.

A.

True

B.

False

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Question # 64

In logical SIP entities, UAS is used to initiate SIP requests and UAC is used to return SIP responses.

A.

True

B.

False

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Question # 65

The three modes of operation of the proxy are: Call Stateful, Stateless, transaction Stateful.

A.

True

B.

False

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Question # 66

All MCUs under the same service area must have the same prefix number.

A.

True

B.

False

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Question # 67

The MCU has built-in WEB it can also manage other McUs in addition to this MCU. ( )

A.

True

B.

False

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Question # 68

MsDA is the master-slave decision response message, which carries the Master or Slave flag, which refers to the state of the local side.

A.

True

B.

False

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Question # 69

In the Cseq header domain, Cseq is used to uniquely identify an invitation or a registration. ( )

A.

True

B.

False

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Question # 70

The core of the NAT mapping is to modify the packet header (source address) to translate the source address into a NAT address ( ).

A.

True

B.

False

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Question # 71

A session-independent nature is that a SIP-URL represents a resource or user that needs to be accessed, and the message body can carry anything.

A.

True

B.

False

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Question # 72

Illuminance is based on the luminous flux received by the vertical surface as the standard, and if oblique illumination is used, the illuminance decreases. ( )

A.

True

B.

False

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Question # 73

In video conferencing, the empty field noise is required not to be greater than ( )dB. (Fill in the blanks)

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Question # 74

The secondary stream can only be displayed on one display with the mainstream, not independently.

A.

True

B.

False

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Question # 75

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.

A.

True

B.

Error

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Question # 76

CANEL transactions can be used for both CANCEL INVITE transactions and CANCEL non-INVITE transactions.

A.

True

B.

False

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Question # 77

SDP ( Session Description Protocol ) is a transport layer control protocol used to describe multimedia sessions . ( )

A.

True

B.

False

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Question # 78

The sound test is to test whether the terminal audio output is correct.

A.

True

B.

False

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Question # 79

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.

A.

Right

B.

False

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Question # 80

Wireshark is a network packet analysis tool whose main role is to capture network packets in real time on the interface and display the detailed protocol information of the packets in detail. ( )

A.

True

B.

False

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Question # 81

During the MCU main control board backup reversal process, the conference and venue status on the SMC will be offline for about 10 seconds.

A.

True

B.

False

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Question # 82

The packet loss rate recorded by NLOG does not include packet loss from data devices on the line.

A.

True

B.

False

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Question # 83

In video conference rooms, the illuminance cannot be too low because whether it is a CCD or CMOS, the camera will have a lot of snowflake noise in low light.

A.

True

B.

False

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Question # 84

GK's call access control function mainly refers to whether to allow nodes to initiate calls based on user rights, network bandwidth and other conditions.

A.

True

B.

False

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Question # 85

In H460 networking, the H.245 TCP connection of the private network terminal is established with TS.

A.

True

B.

False

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Question # 86

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)

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Question # 87

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.

A.

True

B.

False

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Question # 88

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.

A.

True

B.

False

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Question # 89

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)

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