TCP Server Processes example

TCP Server Processes example

1. 1. Client sends TCP Requests

   • Client 1 is requesting web services and Client 2 is requesting email service of the same sever.

2. 2. Request destination port

   • Client 1 is requesting web services using well-known destination port 80 (HTTP) and Client 2 is requesting email service using well-known port 25 (SMTP).

3. 3. Request source port

   • Client requests dynamically generate a source port number. In this case, Client 1 is using source port 49152 and Client 2 is using source port 51152.

4. 4. Response destination port

   • When the server responds to the client requests, it reverses the destination and source ports of the initial request. Notice that the Server response to the web request now has destination port 49152 and the email response now has destination port 51152.

5. 5. Request source port

   • The source port in the server response is the original destination port in the initial requests.