Why DNS works on both TCP and UDP
DNS and some other Services work on both the TCP and UDP Protocols. Two protocols are different from each other. TCP is a connection-oriented protocol whereas UDP is a connection-less protocol.
A client computer will always send a DNS Query using UDP Protocol over Port 53. If a client computer does not get response from a DNS Server, it must re-transmit the DNS Query using the TCP after 3-5 seconds of interval.
Most DNS requests and responses are small in size (less than 512 bytes) so will use UDP, a best effort protocol. While less reliable than TCP, it is faster and well suited for small amounts of data. UDP is also less resource intensive, however this reasoning can be discarded in the modern day, as it has a negligible impact on our technology.
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