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 />
Lab 1 Answers: Tracing <strong>TCP</strong> Connection<br />
Examine Network Configuration<br />
3. What is the Slow Start Initial Count (MSS)? 2<br />
4. How many <strong>TCP</strong> segments will be sent after the connection is established? 2<br />
5. What is the Maximum Segment Size? 1460 Bytes<br />
6. Estimate how many <strong>TCP</strong> data segments will be used to send 5,000 Bytes? 4<br />
Examine 3-Way H<strong>and</strong>shake<br />
4. Scroll up to the first event that gets printed. You can see that the server opens a connection at<br />
time 0.<br />
a. Is this a passive or active connection? Passive<br />
b. What is the local port number used by the server? 20<br />
c. When did the client receive an OPEN request from the application? At time 101sec,<br />
event 125<br />
5. What are the sequence numbers of the packets comprising 3-way h<strong>and</strong>shake?<br />
a. First segment: 25250000<br />
b. Second segment: 25250001<br />
c. Third segment: 25250001<br />
6. Were any options set in the SYN packets? Yes, MSS <strong>and</strong> SACK-Permitted<br />
Examine Slow Start<br />
1. Server’s <strong>TCP</strong> process then sends its first application data.<br />
a. How many segments are sent out at the beginning? 2<br />
b. How is this related to the Slow Start Initial Count from step 3b of the Examine Network<br />
Configuration section?<br />
It is equal.<br />
c. What are the sequence numbers <strong>and</strong> data length of the first 2 segments?<br />
Sequence number<br />
Length<br />
1 st data segment 25250002 1460<br />
2 nd data segment 25251462 1460<br />
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