题目内容

Suppose the following three 8-bit bytes: 01010101, 01110000, 01001100. What’s the 1s complement of the sum of these 8-bit bytes?

A. 00010001
B. 11101101
C. 00010010
D. 10001000

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UDP and TCP both have the fields except ____.

A. source port number
B. destination port number
C. checksum
D. receive window

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 [nextseqnum,base+N-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

Which of the following about TCP is not correct?

A. It is a connectionless protocol
B. Point-to-point protocol
C. Reliable, in-order byte steam protocol
D. Pipelined protocol

Which of the following about TCP is not correct?

A. It is a connectionless protocol
B. full duplex data transfer protocol
C. connection-oriented protocol
D. flow controlled protocol

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