CCNA Complete Guide - 2nd Edition.
http://www.scribd.com/doc/27333387/CCNA-Complete-Guide-2nd-Edition By Yap Chin Hoong
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LAYER 4 of OSI Model
The Transport Layer Abstract This article discusses how the transport layer is fundamental to the operation of the TCP/IP layered network architecture. Introduction When computers communicate with one another, certain rules, or protocols, are required to allow them to transmit and receive data in an orderly fashion. Throughout the world, the most widely adopted protocol suite is TCP/IP. Understanding how TCP/IP functions is important for a larger understanding of how data is transmitted in network environments. The way in which IP delivers a packet of data across a network is a fundamental concept in the TCP/IP architecture used in large networks. Understanding how data is transmitted via IP is central to understanding how the TCP/IP suite of protocols functions overall. This, in turn, adds to an understanding of how data that is communicated across networks can be prioritized, restricted, secured, optimized, and maintained. For the Inter...