Cisco routers are everywhere that networks are. They come in all sizes frominexpensive units for homes and small offices to equipment costing well over100000 an... » 

Cisco routers are everywhere that networks are. They come in all sizes frominexpensive units for homes and small offices to equipment costing well over100000 and capable of routing at gigabit speeds. A fixture in todaysnetworks Cisco claims roughly 70 of the router market producing highendswitches hubs and other network hardware. One unifying thread runs throughthe product line virtually all of Ciscos products run the InternetworkOperating System or IOS. If you work with Cisco routers its likely that youdeal with Ciscos IOS softwarean extremely powerful and complex operatingsystem with an equally complex configuration language. With a cryptic commandline interface and thousands of commandssome of which mean different thingsin different situationsit doesnt have a reputation for being userfriendly.Fortunately theres help. This second edition of Cisco IOS in a Nutshellconsolidates the most important commands and features of IOS into a singlewellorganized volume that youll find refreshingly userfriendly. This handytwopart reference covers IOS configuration for the TCPIP protocol family. Thefirst section includes chapters on the user interface configuring lines andinterfaces access lists routing protocols and dialondemand routing andsecurity. A brief examplefilled tutorial shows you how to accomplish commontasks. The second part is a classic OReilly quick reference to all thecommands for working with TCPIP and the lowerlevel protocols on which itrelies. Brief descriptions and lists of options help you zero in on thecommands you for the task at hand. Updated to cover Cisco IOS Software MajorRelease 12.3 this second edition includes lots of examples of the most commonconfiguration steps for the routers themselves. Its a timely guide that anynetwork administrator will come to rely on. «