UDP Header Fields | UDP Protocol

UDP is a transport layer protocol. Its simple and connectionless protocol. It means before transmission of the actual message, no connection is established between two nodes.

It has four important fields. It has source port and destination port addresses to identify different application programs. Port addresses are 16 bits long.

There is a length field of 16 bits which gives the maximum length of 2^16 bits long including data and header part of the datagram.

Checksum field of 16 bits helps to find out errors which may have occurred during transmission.

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