Cisco dominates the internetworking scene with an over 80 per cent share of the routers used on the Internet. The mid-level Cisco Certified Network Professional (CCNP) certification validates advanced knowledge of Cisco-based networks. The Cisco Internetwork Troubleshooting (CIT) exam, No. 642-831, is one of the four core exams that cover a wide range of topics, including determining an effective troubleshooting strategy at the various layers of the OSI network model. Cisco is in the process of revising the four CCNP exams, covering new technologies and adding new questions to the pool. CCNP: Cisco Internetwork Troubleshooting Study Guide offers a comprehensive study of the topic but relies on practical experience as well. The book covers all of the stated CIT objectives, beginning with a theoretical discussion of troubleshooting methodology and generic troubleshooting tools followed by coverage of Cisco's relevant tools and commands. Then troubleshooting is tackled for TCP/IP, Novell, ISDN, AppleTalk, and other environments. Like other study guides in this Sybex series, the CIT Study Guide includes chapter review questions and clearly states the CIT objectives covered in each section. However, laboratory exercises for troubleshooting are difficult to construct and are less frequent in this installment. A companion CD-ROM includes the EdgeTest CIT software with 200 questions and a trial copy of Visio Professional, as well as AG Group's NetTools and EtherPeek. Troubleshooting is often more of an art than a science. Within any product category such as Cisco switches and routers, however, there are plenty of concrete technical specifics to master. This complete course will get you ready to ace the CIT test. Topics covered: Troubleshooting methodology, OSI layer attributes, test equipment, Cisco diagnostic commands and tools, troubleshooting (TCP/IP, serial lines and frame relay), ISDN, Novell networks, AppleTalk networks, and switched Ethernet networks.

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