How does one decide between TCP and UDP? This question was originally answered on Quora by Keith Winstein.

The advantage to using TCP for transporting the control protocol is that you’re guaranteed the control information is delivered. On the other hand, you also could use UDP if the protocol is ...

As TCP is a connection-oriented protocol -- it requires a handshake and session between sender and receiver. UDP can route packets based on a variety of factors.

Optimizing a VPN isn't just about picking a protocol - choosing UDP or TCP can make a big difference, too.

27 under udp is part of smtp, rather esmtp - pop mail service of SLMail. If it is port 27, it is TCP NSW (National Software Works).<BR><BR>Port 20670 I thought was one of the old gaming ports but ...

<p>As with any network and internet-capable computing system, many of Apple's services and programs require access to the internet and/or local network using TCP and UDP ports to function properly ...

TCP is considered the "reliable" protocol because it is connection oriented. But if it's so reliable, why do avionics systems like AFDX use UDP?

In this paper, the authors purpose to analysis packets of TCP and UDP while sending an e-mail using a tool called wireshark. Wireshark is a free and open-source packet analyzer.

Scott Reeves shares the wireshark filters that helps you isolate TCP and UDP traffic.