Telnet is a simple yet powerful program that allows you to connect to a remote Cisco router or switch, and then configure it as though you were right at the console. Telnet is also one of those features that seems so very simple, until you get asked a half dozen questions about it on your CCNA exams. As with all topics, it’s the details you know about Telnet that will help you pass the Intro and ICND exams.
Let’s take a look at a few of these details. We’ll begin by debunking one common belief about Telnet:
Telnet runs at layer 7 of the OSI model, not layer 3!
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