User Datagram Protocol (UDP)

This section covers UDP as a lightweight, connectionless transport protocol. It examines the UDP header format, checksum usage, lack of reliability mechanisms, low overhead operation, and the types of applications that benefit from fast and simple datagram delivery.

Learning Goals

Describe the connectionless service model of UDP and explain how it differs from connection-oriented transport.
Identify and interpret the fields of the UDP header, including source port, destination port, length, and checksum.
Explain why UDP does not provide reliability, sequencing, retransmission, or flow control mechanisms.
Evaluate the advantages and limitations of UDP for applications such as DNS, streaming, real-time communication, and simple request-response services.
Select UDP appropriately for a given application scenario based on overhead, latency sensitivity, and tolerance for packet loss or reordering.

Process-to-Process Communication

Transmission Control Protocol (TCP)