Understanding TCP/IP Model Internals and Interfaces
Understanding TCP/IP Model Internals and Interfaces
Understanding TCP/IP Model Internals and Interfaces
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1508 <strong>Underst<strong>and</strong>ing</strong> <strong>TCP</strong>/<strong>IP</strong> <strong>Model</strong> <strong>Internals</strong> <strong>and</strong> <strong>Interfaces</strong><br />
• What is the local port number used by the server? _________________<br />
• At what event did the client’s <strong>TCP</strong> process receive an OPEN request from the application?<br />
_________________<br />
5. What are the sequence numbers of the segments comprising 3-way h<strong>and</strong>shake?<br />
a. First segment: ____________<br />
b. Second segment: ____________<br />
c. Third segment: ____________<br />
6. Were any options set in the SYN packets? _________________________________________<br />
Hint: See trace at events 125 <strong>and</strong> 146.<br />
Examine Slow Start<br />
1. Server’s <strong>TCP</strong> process then sends its first application data at event 230.<br />
a. How many segments are sent out at the beginning? ___________<br />
b. How is this related to the Slow Start Initial Count from step 3 of the Examine Network<br />
Configuration section?<br />
___________<br />
c. What are the sequence numbers <strong>and</strong> data length of the first 2 segments?<br />
1 st data segment<br />
2 nd data segment<br />
Sequence number<br />
Length<br />
2. What should be the ACK number acknowledging the second segment sent from client?<br />
___________<br />
3. Is this the same as the ACK number sent at event 276? ___________<br />
4. How many more segments did the server send before closing a connection? ___________<br />
5. How many bytes of data did the server send? ___________<br />
6. What was the actual Maximum Segment Size? ___________<br />
7. Is the number of segments sent by the server the same as the one you predicted in step 7 of<br />
Examine Network Configuration section?<br />
___________<br />
Examine Connection Termination<br />
1. Which side starts the connection termination process?<br />
hint: look for FIN segments<br />
___________<br />
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© 2010 OPNET Technologies, Inc.<br />
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