Now that you understand what TCP and UDP are, we can start discussing TCP and UDP ports in detail. Lets move on to the next section where we can describe the concept of ports better. TCP and UDP Ports

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Key Difference between TCP and UDP. Let us discuss some of the major key differences between TCP vs UDP: One of the main key differences between TCP and UDP is TCP is connection-oriented, and UDP is connectionless. To transfer data TCP must establish a connection with other hosts.

User Datagram Protocol - Wikipedia Aug 24, 2001

OpenVPN over TCP vs. UDP: What is the Difference? Find out now

networking - HTTP vs TCP vs UDP with this example? - Super UDP In UDP client is like TCP only but with less reliability and better speed. More or less. Larger messages are fragmented into bite-sized packets by UDP and TCP. TCP guarantees that all packets arrive and are in correct order, otherwise nothing is received. This can take some time and a few retries. UDP doesn't care. Is DNS TCP or UDP Port 53? | Infoblox DNS Security Center FAQ The answer is DNS is mostly UDP Port 53, but as time progresses, DNS will rely on TCP Port 53 more heavily. DNS has always been designed to use both UDP and TCP port 53 from the start 1, with UDP being the default, and fall back to using TCP when it is unable to communicate on UDP, typically when the packet size is too large to push through in a single UDP packet.