计算机网络试卷.docx

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华南理工大学期末考试
《 works 》A试卷
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2. 所有答案请直接答在试卷上(注:选择题答案请填入题目前面的表格中);
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4. 本试卷共五大题,满分100分, 考试时间120分钟。
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Select the correct choice. (30 scores, every one is 2 scores)
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solution
It is the architecture for TCP/IP protocol stack, which one below doesn’t belong to the application layer ( B )?
A. C. POP D. SMTP
Why do HTTP, FTP, SMTP and POP3 run on top of TCP rather than UDP? ( A )
A. Reliable data transfer B. Throughput
C. Real-time D. Security
Suppose Host A wants to send a file to Host B, there are three links between A to B, and the rates of the three links are respectively R1=2 Mbps, R2= 1Mbps, and R3= 4 Mbps. If no any other traffic in work, what is the throughput for the file transfer? (
B )
A. 2 Mbps B. 1 Mbps C. 4 Mbps D. 7Mbps
Suppose an application generates chunks of 120 bytes of data every second, and each chunk gets encapsulated in a TCP segment and then an IP datagram(no options fields).What percentage of each datagram will contain application data? ( B )
A. 80% B. 75% C. 60% %
The job of delivering the data in a transport-layer segment to the correct socket is called ( A ).
A. Demultiplexing B. Multiplexing
C. TDM D. FDM
Consider sending a 999 byte datagram into a link that has an MTU of 500 bytes , ( B )
2 fragments are created with offset field value 0,500, respectively
3 fragments are created with offset field value 0, 480, 960, respectively
3 fragments are created with offset field value 0, 60, 120, respectively
None of these above
About the encapsulation relationships of segment、datagram and frame, which of the following is correct? ( C )
A. Segment is encapsulated within the frame, and the frame is encapsulated within the datagram.
B. Dat