So TCP and UDP can use identical port numbers for different applications Inclusion of the source port in the header makes it possible for the receiver to be able to reply to the sender

A complete information about UDP-related standards is published by RFC Editor [RFC]. Several relevant RFC articles as well as further reading materials are listed at the end of this article.

After a few seconds, a process needs to send a user datagram. It delivers the data to the output module which adds the UDP header and sends it.

Why is there a UDP? no connection establishment (which can add delay) simple: no connection state at sender, receiver small header size no congestion control: UDP can blast away as fast as desired

UDP uses pseudo header to define the checksum. It is calculated over the combination of pseudo header and UDP message. The pseudo header contains: the IP Source Address field,the IP …

" Suppose we use UDP instead of TCP under HTTP for designing a web server where all requests and responses fit in a single packet. Suppose a 100 clients are simultaneously communicating with this …

This document updates RFC 768 with an extension to UDP that provides space for transport options including their generic syntax and semantics for their use in UDP's stateless, unreliable message …