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

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?

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

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 ...

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

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.