Answer by Keith Winstein on Quora, A lot of people ask this question and think in these terms, but here's a different point of view. TCP and UDP are not at the same level of abstraction and they ...

When working with sockets you can use either the TCP/IP (Transmission Control Protocol/Internet protocol) or UDP/IP (User Datagram Protocol/Internet protocol) communication mechanisms.

For those of you who are fluent with sockets programming and recall that listening TCP sockets are forked upon reception of a connect ... for TCP/UDP sockets, the filter is applied to layer 4 ...

TCP vs. UDP vs. ICMP: Understanding the Differences. ... netstat -tulnp # Show TCP/UDP listening ports and active connections ss -tulnp # Alternative to netstat for socket ... and has been a Linux ...