Would you like to configure multiple routers, switches, and firewalls, all at the same time, from the console? This is what you want to do when practicing and learning configurations to prepare for the CCNA, CCNP, or CCIE. In fact, I have also used this in the rack of a production network to ensure that […]

While the OSI Model may seen like some useless & arcane topic that you only study to get your CCNA, I believe it is very valuable in understanding how networks work and how to troubleshoot them. In one of my most recent articles, I cover the OSI model and explain how you can use it […]

Just published, my most recent article covers, step by step, how to secure your Cisco router using passwords. I start off with the different levels of the Cisco IOS and the different passwords that are available. Then, I move on to show you exactly how to configure passwords in the Cisco IOS to secure your […]

I wanted to share with all the Happy Router.com readers some very cool news about a new product. Wildpackets just introduced protocol analyzer that can capture and analyze Ethernet traffic at a rate of 10Gb (full-duplex)! This amazing product will be on display this year at Cisco Networkers 2008 in Orlando, Florida! Here […]

Why buy a rack of routers when you can simulate one on your PC? That’s right, that is what you can do for free with Dynamips & Dynagen. These very cool Cisco router, switch, and PIX emulation products are free. All you need to provide is the IOS and a PC to run it on. […]

In David’s latest TechRepublic article, he explains how the seven layers of the OSI Model can help you as a Cisco administrator. Get a brief overview of the OSI model and learn why it is more than just a textbook concept — a true understanding of it will help you every day of your career. […]

In this article, author David Davis explains how to use a distribute-list to filter out routing updates in the Cisco IOS. A distribute-list is used to control routing updates either coming to your router or leaving from your router. The distribute-list feature works with a number of different routing protocols. You […]

In this article, author David Davis explains how Cisco’s Network Security and Deployment Methodologies can help you and any enterprise customer. This knowledge is useful whether you are implementing security on your network, doing a major router upgrade or even working on a personal project at home. For the full article, […]

I was just checking out a new article published over at the Petri IT Knowledgebase, covering How to configure EIGRP in the Cisco IOS. This article is by David Davis and covers the basics of EIGRP configuration, step by step.

In the lastest article published by David Davis, CCIE, learn how you can use Cisco IOS debug commands to troubleshoot common problems on your Cisco router or switch. Here is the URL to read more: Troubleshoot Cisco routers and switches using the debug commands.