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IN THIS CHAPTER

Introducing the Internet

Familiarizing yourself with TCP/IP standards

Figuring out how TCP/IP lines up with the OSI Reference Model

Discovering important TCP/IP applications

Many years ago, Transmission Control Protocol/Internet Protocol (TCP/IP) was known primarily as the protocol of the Internet. The biggest challenge of getting a local area network (LAN) connected to the Internet was figuring out how to mesh TCP/IP with the proprietary protocols that were the basis of the LANs — most notably Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX) used by Novel networks and NetBIOS Extended User Interface (NetBEUI) used by Microsoft networks.

Eventually, both IPX/SPX and NetBIO gave way to TCP/IP as the basis for local area networking, eliminating the challenge of translating IPX/SPX or NetBEUI to TCP/IP. As a result, TCP/IP is not just the protocol of the Internet now, but it’s also the protocol on which most LANs are based.

This chapter is a gentle introduction to the Internet in general and the TCP/IP suite of protocols in particular. After I get the introductions out of the way, you’ll be able to focus more in-depth on the detailed TCP/IP information given in the remaining chapters of Book 2.