This post gives a brief overview of the UDP protocol, including the properties of UDP, its theory of operation and the structure of UDP headers, pseudo headers and UDP encapsulations.
Overview of the UDP protocol
Transport Layer
Contains posts on transport layer of computer networking
Functional Overview of Transport Layer
This post gives a brief overview of the functions provided by the Transport Layer. Functions described include reliability, flow control, congestion control, application layer multiplexing/demultiplexing and sockets.