计算机网络实验3TCP实验.pdf

: .
ent as a SYNACK segment?
答：The sequence number of the SYNACK segment sent by is:0；
SYNACK segment 中 ACKnowledgement 的值为 1；
－2－ACKnowledgement number 的值为 SYN 消息中 sequence number 加上 1 所得；
SYN 和 Acknowledgement f 都置为 1 说明这是一个 SYNACK segment.

6. What is the sequence number of the TCP segment containing the HTTP POST
command? Note that in order to find the POST command, you’ll need to dig into
the packet content field at the bottom of the Wireshark window, looking for a
segment with a “POST” within its DATA field.
答：第四号报文段是包含 HTTP POST 命令的 TCP 1.


－3－7. Consider the TCP segment containing the HTTP POST as the first segment in the
TCP connection. What are the sequence numbers of the first six segments in theTCP
connection (including the segment containing the HTTP POST)?At what time was each
segment sent? When was the ACK for each segment received?Given the difference
between when each TCP segment was sent, and when itsacknowledgement was received,
what is the RTT value for each of the sixsegments? What is the EstimatedRTT value (see
page 249 in text) after thereceipt of each ACK? Assume that the value of the
EstimatedRTT is equal tothe measured RTT for the first segment, and then is computed
using theEstimatedRTT equation on page 249 for all subsequent :
Wireshark has a nice feature that allows you to plot the RTT foreach of the TCP segments
sent. Select a TCP segment in the “listing ofcaptured packets” window that is being sent
fro