Models and Methods
Models are guidelines for communications and methods for troubleshooting. This section covers the ISO's OSI model, the DoD's TCP/IP suite, and Cisco's seven-step approach to troubleshooting.
The OSI Model
You have probably dealt with the OSI model more times than you care to remember. Hopefully, however, this review will make the OSI model meaningful to you. Use it to troubleshoot the practical lab scenarios that follow as well as to understand and review internetworking topics.
ISO began work on the OSI model in the late 1970s and published the OSI reference model in 1984 to facilitate interoperability among vendors. It is one of the best troubleshooting models around, and every certification vendor will test to make sure ...
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