There are a lot of commands in the Cisco IOS that you can use for troubleshooting. It depends on what the symptoms are and what networking technology you are using (eg ATM, ethernet, frame relay). The more common of course are your sh ip int brie, sh run, sh ver, sh controllers etc but there […]

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 […]

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, […]

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 […]