tailieunhanh - Networking: A Beginner’s Guide Fifth Edition- P26

Networking: A Beginner’s Guide Fifth Edition- P26:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers. | Chapter 8 Understanding Networking Protocols 107 complex Windows-based network that also uses TCP IP however the NetBIOS names resolve to TCP IP addresses through the use of Windows Internet Name Service WINS . The names can also be resolved using static name definition entries contained in a file called LMHOSTS for LAN Manager HOSTS . Because some networking applications still use NetBIOS Names either WINS or LMHOSTS allows such applications to continue to function in a TCP IP-only network. As far as the application is concerned it is still working with NetBIOS while TCP IP performs the actual work in the background. AppleTalk AppleTalk has been extended into AppleTalk Phase 2 which now allows routing of AppleTalk packets assuming an AppleTalk Phase 2-capable router . The Phase 2 variant can run over Ethernet Token Ring or Apple s LocalTalk media. Under Ethernet AppleTalk uses a variant of the frame type called Ethernet Subnetwork Access Point SNAP . AppleTalk has an important history for Apple Macintosh networking but Apple now fully supports and recommends TCP IP for its computers. Chapter Summary This chapter is built on the knowledge you gained in earlier chapters delving into various important protocols involved in virtually all networks including the Internet. You learned primarily about the TCP IP protocol which has essentially displaced older protocols such as IPX SPX and NetBIOS NetBEUI although these older protocols are still used . You also learned about some specific application-layer Internet protocols such as SMTP DHCP and HTTP. These are all vital protocols to understand for any networking professional. It would be nice if the protocols discussed in this chapter were all you had to contend with but unfortunately many more protocols exist. Some are specific to certain functions such as remote access to a network and are discussed in appropriate chapters within this book. Others are still being developed and are not a factor now but may be in .

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• Network
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