Uses for UDP
Although UDP does not provide any services beyond Application Layer protocol identification and a checksum, there are uses for sending data using UDP, including the following:
Lightweight protocol. To conserve memory and processor resources, some Application Layer protocols require the use of a lightweight protocol that performs a specific function using a simple exchange of messages. A good example is Domain Name System (DNS) name queries. Typically, a DNS client sends a DNS Name Query Request message to a DNS server. The DNS server responds with a DNS Name Query Response message. If the DNS server does not respond, the DNS client retransmits the DNS Name Query Request message.
If all the DNS clients used TCP rather than UDP, all DNS ...
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