Describe each mode.
Give examples of protocols that implement the various modes of TCP/IP operation.
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A:
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.
Kevin Driedger
2010-08-24 14:09:40
Wow, two guys named Kevin Driedger on SO - what a coincidence!
Hamish Grubijan
2010-08-24 14:17:00
Interesting answer. Probably not what I'd have suggested from university or Cisco's material. Oh wait, this guy answered his own question. Which means it's probably made up. -1 for that. The ridiculousness of this question is the fact that TCP must be bi-directional in order to complete the 3-way handshake. TCP by its very nature uses sliding windows as it expects communications to be full-duplex and delayed.
PP
2010-08-24 14:17:03
@PP: Ya, I was a little curious about an example of simplex TCP :)
David
2010-08-24 14:21:06
@PP: Feel free to make an answer not "made up"!
Kevin Driedger
2010-08-24 14:33:59
@Hamish, @PP: Read the SO FAQ please: "It's also perfectly fine to ask and answer your own question, as long as you pretend you're on Jeopardy: phrase it in the form of a question."
Frank Shearar
2010-09-03 10:55:30