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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Introducing TCP/IP

Because TCP/IP is so central to working with the Internet and intranets, it’s essential for you to understand it in detail. I’ll begin by giving you some background on TCP/IP and how it came about and then move on to describing the important technical goals defined by the original designers. After that, you’ll find out how TCP/IP compares to a theoretical model—the Open Systems Interconnection (OSI) model.

A Brief History of TCP/IP

TCP/IP first came on the scene in 1973. Later, in 1978, it was divided into two distinct protocols: TCP and IP. Then, in 1983, TCP/IP replaced the Network Control Protocol (NCP) and was authorized as the official means of data transport for anything connecting to ARPAnet, the Internet’s ancestor ...

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