Many thousands of engineers like you use his tools and training on a regular basis.ĭavid has developed over 20 courses for HP which are used worldwide. David has the highest rated and most popular course in the GNS3 Academy: SDN and OpenFlow Introduction.ĭavid's software tools and training have been downloaded +100,000 times. Several of the screen captures from The Accidental Administrator Cisco Router Step-by-Step Configuration Guide were taken using emulated routers running in GNS3.David Bombal (CCIE #11023 Emeritus) passed his Cisco Certified Internetwork Expert Routing and Switching exam in January 2003. Still, for practicing basic IOS commands, setting up access-control lists, and experimenting with routing protocols, the older versions of the software will be helpful. It's important to realize that on older platforms such as those supported on GNS3, the most recent software available could be three or four years old. An easy way to get the software is to purchase one of the supported routers, making sure that the router you purchase has the most recent version of the software, such as 12.3 or 12.4. You have to provide the router software, but GNS3 itself is free. Are you familiar with GNS3 ( It's a free router emulator platform which is used by millions of people to learn and test Cisco IOS commands. I used to own six 1720s and found them excellent for learning, experimenting, and teaching. In the meantime, I just received an email from a reader asking about using a Cisco 1720 router to learn IOS commands and thought I'd share my response here. I'm hoping to finish both of them by the end of January and then I can get back to blogging. I've been absent from this blog for a while, because I'm working on completing two more books in the Accidental Administrator series.
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March 2023
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