题目内容

If we define N to be the window size, base to be the sequence number of the oldest unacknowledged packet, and next-seq-num to be the smallest unused sequence number, then the interval [base, nextseqnum-1] corresponds to packet that ____.

A. can be sent immediately
B. have already been transmitted and acknowledged
C. cannot be used
D. have been sent but not yet acknowledged

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The field of Length in UDP segment specifies the length of ____.

A. the UDP segment, not including the header
B. the UDP segment, including the header
C. the UDP segment’s header
D. the Length field

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In TCP segment header, which field can implement the reliable data transfer?

A. source port number and destination port number
B. sequence number and ACK number
C. urgent data pointer
D. Receive window

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In the following four descriptions about TCP connection management, which one is not correct?

A. Either of the two processes participating in a TCP connection can end the connection
B. If the FIN bit is set to 1, it means that it wants to close the connection
C. In the first two step of the three-way handshake, the client and server randomly choose an initial sequence number
D. In the three segments of the three-way handshake, the SYN bit must be set to 1

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Suppose host A sends two TCP segments back to back to host B over a TCP connection. The first segment has sequence number 42, and the second has sequence number 110. If the 1st is lost and 2nd arrives at host B. What will be the acknowledgment number?

A. 43
B. 42
C. 109
D. 110

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If we define N to be the window size, base to be the sequence number of the oldest unacknowledged packet, and next-seq-num to be the smallest unused sequence number, then the interval [base, nextseqnum-1] corresponds to packet that ____.

A. can be sent immediately B. have already been transmitted and acknowledged C. cannot be used D. have been sent but not yet acknowledged

The field of Length in UDP segment specifies the length of ____.

In TCP segment header, which field can implement the reliable data transfer?

In the following four descriptions about TCP connection management, which one is not correct?

Suppose host A sends two TCP segments back to back to host B over a TCP connection. The first segment has sequence number 42, and the second has sequence number 110. If the 1st is lost and 2nd arrives at host B. What will be the acknowledgment number?

A. can be sent immediately
B. have already been transmitted and acknowledged
C. cannot be used
D. have been sent but not yet acknowledged