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The Transport Control Protocol (TCP) is a low-level part of the protocol stack used by the Internet. It sits directly above the IP layer and is responsible for making sure that dropped packets are resent.

60
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Just to make sure we're on the same page (your question is ambiguous this way), asking to bind TCP on port 0 indicates a request to dynamically generate an unused port number. In other words, the … port 0, but that would be considered a bad practice. This behaviour is not officially specified by POSIX, IANA, or the TCP protocol, however.1 You may find this interesting. That's why you cannot …
answered Jan 22 '15 by goldilocks
15
votes
whether a port is accessible through a firewall and, if so, whether anything is listening on it. Here's three different scenarios involving a tcp request which you can observe with wireshark, or some … times out or you get bored. 3) Firewall allows packet (or there is no firewall), but nothing is listening on the port. You get a TCP RST/ACK message back. I presume the TCP protocol requires this. In …
answered Apr 26 '13 by goldilocks
1
vote
the task (eg, TCP sockets, and you very definitely want to use one for parsing the XML). So the question is really which of those you find easiest to use. …
answered Jul 9 '13 by goldilocks