TCP is one of those protocol, and it can run on top of IP datagrams (as is done typically) or UDP datagrams, in the case of applications like MixApp that don't want to use the operating system's ...

Understanding TCP and UDP Port Addresses. Whenever an IP-based service or application creates a connection between a client and a server -- or between a pair of peers -- it uses either TCP or UDP ...

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Again,UDP is a much simpler protocol than TCP and is useful in situations where the reliability mechanisms of TCP are not necessary. Transmission Control Protocol (TCP) ...

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 ...

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.

According to this group, starting with February 1, 2020, DNS servers that can't handle DNS queries over both UDP and TCP may be pushed out of the DNS ecosystem and stop working.

As we have seen, there are three distinct call points inside the kernel where the filter may get invoked: the TCP and UDP (layer 4) receive functions, and the PF_PACKET (layer 2.5) receive function.