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Start to test:

1. The following description about FEC advantages and disadvantages, which is correct? (Choose two answers)

A. High requirement on time delay, the existing network is difficult/hard to use; only has effect on a small packet loss scene; exacerbate image shake

B. Basically take no bandwidth resources, has so small impact on image quality is small

C. adds redundant data, take up some bandwidth, lower video effects; there is no way for a burst packet loss; there must a delay if introduce

D. through grouping combination check way, it can restore some probability of loss of data, has effect on general packet loss scenarios

Question 1 of 10

2. What is the main role of H.245 protocol? (Choose two answers)

A. Real-time Transport

B. capability negotiation

C. Video Coding

D. Media Control

Question 2 of 10

3. Which of the following can achieve Video codec protocol?

A. H.225

B. H.239

C. H.245

D. H.261

Question 3 of 10

4. When you forget the HD end-user name and password and cannot log on to the Web interface, you can only restore the factory settings.

A. TRUE

B. FALSE

Question 4 of 10

5. The nature's frequency response ability that the human ear can perceive can reach 20Hz-20KHz, using G.711, G.722, G.728 and other audio standard. The audio width is only 50Hz-7KHz. So using AAC-LD way solves this problem in high definition video communication process.

A. TRUE

B. FALSE

Question 5 of 10

6. Background color take the skin color's complementary color, and avoid large areas skin color's adjacent color or similar color; generally use the blue, gray, blue-gray combined tones and others; large line's background pattern make the picture look simple and clear.

A. TRUE

B. FALSE

Question 6 of 10

7. RFC2190 defines three kinds of formats payload header in total for the H.263 video codec formats, namely: Mode A, Mode B and Mode C. A mode is recommended and typically used transmission mode.

A. TRUE

B. FALSE

Question 7 of 10

8. In H.460 signaling interworking scenario ( ).

A. public network terminals using H.460 protocol communication

B. private network terminals using H.460 protocol to communication

C. public and private networks terminals using the standard H.323 protocol communication

D. None of the above is correct

Question 8 of 10

9. Which of the followings belong to extension request? (Choose 3 answers)

A. MESSAGE

B. PUBLISH

C. OPTIONS

D. NOTIFY

Question 9 of 10

10. RRJ send to [（218.5.64.98:18616）] [59285094444]

[[0x00000065:err_reg_wrong_account_or_passwork]]

From the above logs, what is the registration failure reason?

A. account and password error

B. segment registration restrictions

C. network bandwidth limits

D. communication lines Abnormal

Question 10 of 10

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