题目内容

The job of gathering data chunks, encapsulating each data chunk with header information to create segments and passing the segments to the network is called ____.

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

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In the following four descriptions about the relationship between the transport layer and the network layer, which one is not correct?

A. The transport-layer protocol provides logical communication between hosts
B. The transport-layer protocol provides logical communication between processes
C. The services that a transport-layer protocol can provide are often constrained by the service model of the network-layer protocol
D. A computer network may make available multiple transport protocols

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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

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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 [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

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The job of gathering data chunks, encapsulating each data chunk with header information to create segments and passing the segments to the network is called ____.

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

In the following four descriptions about the relationship between the transport layer and the network layer, which one is not correct?

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

UDP and TCP both have the fields except ____.

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