Describe each mode.
Give examples of protocols that implement the various modes of TCP/IP operation.
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Full-Duplex allows for communication in either direction at any time.
An example is HTTP Pipelining.
Half-Duplex allows for communication in one direction at one time then can switch to the opposite direction.
An example is the POP3 Protocol (as well as FTP, NNTP, SMTP).
Simplex allows for communication in one direction only and doesn’t allow switching directions. This is sometimes specificed programmatically as Simplex Server or Simplex Client.