题目内容

Which of following about UDP is not correct.

A. It is a reliable data transfer protocol
B. It is connectionless
C. no handshaking between UDP sender, receiver
D. it is a best effort service protocol

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DNS uses ____ service.

A. TCP
B. UDP
C. Both TCP and UDP
D. None of above

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The UDP header has only ____ fields.

A. 2
B. 4
C. 1
D. 3

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Which of the following does not included in UDP header.

A. Source port number
B. Destination port number
Checksum
D. Sequence number

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In the following four descriptions about MSS and MTU, which one is not correct?

A. The MSS is the maximum amount of application-layer data in the segment
B. The MSS is the maximum size of the TCP segment including headers
C. The MSS is typically set by MTU
D. The MTU means the largest link-layer frame

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Which of following about UDP is not correct.

A. It is a reliable data transfer protocol B. It is connectionless C. no handshaking between UDP sender, receiver D. it is a best effort service protocol

DNS uses ____ service.

The UDP header has only ____ fields.

Which of the following does not included in UDP header.

In the following four descriptions about MSS and MTU, which one is not correct?

A. It is a reliable data transfer protocol
B. It is connectionless
C. no handshaking between UDP sender, receiver
D. it is a best effort service protocol