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计算机网络试卷.docx

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华南理工大学期末考试
《 Computer Networks 》A试卷
注意事项:1. 考前请将密封线内填写清楚;
  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);
       :闭卷;
         4. 本试卷共五大题,满分100分, 考试时间120分钟。
题 号
1



5
总分
得 分
评卷人
Select the correct choice. (30 scores, every one is 2 scores)
NO.
1
2
3
4
5

7
8
9

solution
It is the architecture for TCP/IP protocol stack, which one below doesn’t belong to the application layer ( B  )?
A. TELNET    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 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 the network, what is the throughput for the ? ( 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,