Consider Figure 3.5. What are the source and destination port values in the segm

Question

Consider Figure 3.5. What are the source and destination port values in the segments flowing from the server back to the clients' processes? What are the IP addresses in the network-layer datagrams carrying the transport-layer segments? Web client host C Web server B source port: dost. port source port: dest. port 7532 80 26145 80 source IP dest. IP: IP dest. IP Web client host A source port 26145 dest. port 80 source IP dest. IP Figure 3.5 Two clients, using the same destination port number (80) to communicate with the same Web server application

Explanation / Answer

The source and destination ports will be swapped from the server back to the clients' processes.
Hence,
Source and destination ports from web server to host A are 80 and 26145 respectively
Source and destination ports from server B to host C (for left process) are 80 and 7532 respectively
Source and destination ports from server B to host C (for right process) are 80 and 26145 respectively

IP addresses in the network-layer datagrams carrying the transport-layer segments are as below:
Source and destination ip-address from web server to host A are 'b' and 'a' respectively
Source and destination ip-address from server B to host C (for left process) are 'b' and 'c' respectively
Source and destination ip-address from server B to host C (for right process) are 'b' and 'c' respectively

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