网络作业

Computer network

1: List the different protocols that appear in the protocol column in the unfiltered packet-listing window in step 7 above.

Answer:there are such different protocols in the unfiltered packing-listing window:UDP,ICQ,TCP,ARP,DNS,HTTP,NBNS,

2: How long did it take from when the HTTP GET message was sent until the HTTP OK reply was received? (By default, the value of the Time column in the packetlisting window is the amount of time, in seconds, since Ethereal tracing began.

To display the Time field in time-of-day format, select the Ethereal View pull down menu, then select Time Display Format, then select Time-of-day.) Answer:the packing-listing window are below

So the time is:13:20:46-13:20:45。So it cost 1seconds

3: What is the Internet address of the gaia.cs.umass.edu (also known as wwwnet. cs.umass.edu)? What is the Internet address of your computer?

Answer: the Internet address of the gaia.cs.umass.edu is 128.119.245.12. My computer address is 192.168.1.3.

4: Print the two HTTP messages displayed in step 9 above. To do so, select Print from the Ethereal File command menu, and select “Selected Packet Only” and “Print as displayed” and then click OK. 1:the http get picture.

2:the http ok picture.

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