Sockets and WinSock

• Special addresses

  • Network address: first address in subnet (0)
  • Router address: second address in subnet (1)
  • Broadcast address: last address in subnet (255)

• Sockets are the basic TCP requirement

• Socket address

  • IP address of the receiver
  • Port number of the receiving program (80,21,23)
  • Type of port TCP or UDP

• WinSock is an adaptation of sockets to the PC

  • part of the OS (Windows, Linux, etc.)
  • an application programming interface

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