题目内容

There are 6 flag fields. Which one is to indicate that the receiver should pass the data to the upper layer immediately?

A. PSH
B. URG
C. ACK
D. RST

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Suppose the TCP receiver receives the segment that partially or completely fills in gap in received data, it will ____.

A. immediately send ACK
B. immediately send duplicate ACK
C. wait some time for arrival of another in-order segment
D. send single cumulative

_____ imposes constrain on the rate at which a TCP sender can send traffic into the network.

A. sliding window
B. congestion window
C. receive window
D. variable window

This job of delivering the data in a transport-layer segment to the correct socket is called ____.

A. multiplexing
B. de-multiplexing
C. forwarding
D. routing

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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