User Datagram Protocol (UDP)

Objectives
? To introduce UDP and show its relationship to other protocols in the TCP/IP protocol suite.

? To explain the format of a UDP packet, which is called a user datagram, and discuss the use of each field in the header.

? To discuss the services provided by the UDP such as process-to-process delivery, rudimentary error control, multiplexing/ de-multiplexing, and queuing.

? To show how to calculate the optional checksum and why the sender of a UDP packet needs to add a pseudo header to the packet when calculating the checksum.

? To discuss how some application programs can benefit from the simplicity of UDP.

? To briefly discuss the structure of a software package that implements UDP and give the description of control-block, input, and output module.

Features
1-create a process-to-process communication
2-There is no flow control mechanism
3-there is no acknowledgment for received packets control to some extent.
4-UDP is a connectionless
5-Unreliable transport protocol.