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How many times have you typed in the wrong command on a Cisco router, and then have to wait while the DNS lookup times out because the route is trying to resolve that ‘domain’?

Yeah me too. Easy to fix …

Simply enter global configuration mode and type

router(config)# no ip domain-lookup

And the result is no more waiting for the DNS searches to time out.

There’s nothing better than a router sim that has the full Cisco command set available to utilise. All of the router sims (up to now) have a stripped down collection of commands to use.

I stumbled on this website a few weeks ago. It’s an open source product that runs on Windows and Linux boxes, and enables you to simulate multiple routers on the one PC. You can even route real traffic out the ethernet interface of your PC, which takes it past the traditional ‘router sim’ that I am used to. The good thing is that this software supports multiple Cisco routers so it would be perfect for a budding CCNA, CCNP.

I have not tried it as yet as I’m building a PC specifically for this, but a friend of mine told me you need a pretty good PC with a Gig of RAM to make it worthwhile. He runs six instances/routers on his PC.

I would be interested in anyone that has tried this and what their thoughts are.

When I was studying for my CCNA afew years back, I needed some reference. There are plenty of books to read, and I decide to make some notes myself, and store them online where I could easily find them.

Below, are a list of the more common things you need to remember. If you want actual full blown explananations, then it isn’t for you. They are more meant for revision - the common buzz word is ‘cram’

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Cisco IOS command set quick reference