Computer Networking › Section B · The application layer › Topic B.9

Socket programming

Every protocol in this section is, in the end, a pair of programs exchanging bytes through sockets. Writing a tiny client and server yourself, first over UDP and then over TCP, shows exactly what each transport protocol does and does not do for an application.

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In this topic

What a socket program does
Socket types in Python
A UDP server
A UDP client
Worked example: tracing the UDP exchange
A TCP server
A TCP client
Worked example: tracing the TCP exchange
Byte streams and many clients
Common mistakes to avoid
Key takeaways

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