Networking in Python

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Networking in Python

Networking in Python

This lesson covers the essentials of networking in Python, specifically focusing on:

IPv4

  • 32 bits
  • Old, but used everywhere
  • Covered in RFC 791
  • No built in security, trivial checksum

IPv6

  • 128 bits
  • Not used everywhere for a variety of reasons
  • Covered in RFC 2460
  • Built in security, less trivial checksum

TCP

  • Connection oriented
  • Reliable (sort of)
  • Sequence and acknowledgement #s
  • Governed by RFC 793
  • One-to-one communication

UDP

  • Connectionless
  • Unreliable (not exactly)
  • No sequence and acknowledgement #s
  • Governed by RFC 768
  • One-to-one or one-to-many communication

Useful ports (just to name a few)

  • 20/21 FTP
  • 22 ssh
  • 23 telnet
  • 53 DNS

Sockets:

  • The Berkley Software Distribution (BSD) socket
  • The import socket
  • listen (listenqueue)
  • send (string)
  • recv (bufsize[,flags])
  • close()
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