Networks Analyzed @ Netralized

When you have access to a Cisco network device; for example a router, in your console interface appears the host name of the device and the prompt. It looks like that:

In the image above the Hostname of the device is RouterA and the prompt is >.

This prompt means that you are in user mode and you can perform only few commands.

If you are wandering which commands you can perform, just type the symbol of the question mark “?”. When you type a question mark, that means help, the device shows you all the available commands that you can use in this mode.

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I was thinking to write about DSL, VPN, ACLs and other configurations on cisco devices. But first things first, it’s important to know about the operating system of cisco network devices.

IOS (Internetworking Operating System) is the operating system that cisco devices use. IOS belongs to CLI (Command Line Interface) category of operating systems; this means that the administrator has to write commands in order to perform different tasks on the device. Note that some Catalyst network devices use the CATOS operating system, which is also a cisco software product and a CLI operating system.

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To start working with a Cisco device you need to access it somehow. You can configure it via the console port or via telnet.

1. For accessing the network device by using the console port you will need a rollover cable that normally gives you a serial edge and an RJ-45 edge.

Attach the serial edge of the cable, to the serial port of your PC or laptop and the

RJ-45 edge to the console port of the cisco network device.

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