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What is a VLAN? How to Setup a VLAN on a Cisco Switch

What is a VLAN? How to Setup a VLAN on a Cisco Switch Have you ever wondered what a Virtual LAN (or VLAN) is or been unclear as to why you would want one? If so, I have been in your place at one time too. Since then, I have learned a lot about what…

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How to be notified when you Cisco router configuration has changed

Traditionally, to be notified if your Cisco router configuration has changed, you had to use a configuration management and monitoring tool like Tripwire. Applications like that have their use but if you just want a simple email when someone modifies your Cisco router configuration, there is a much easier route. Using SNMP to alert your…

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How to use a Distribute-List to Filter out Routing Updates in the Cisco IOS

While using Dynamic routing protocols, at some point, you will want to filter the routes that are sent out from one router to another OR filter routes that are received into your router. One of the easiest ways to do this is to use a distribute-list. Let’s find out how… What is a Distribute-List? First…

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How can Cisco’s Network Security and Deployment Methodologies help you?

In my time browsing the Cisco website and also from watching Cisco presentations, there are a couple of different methodologies and lifecycle approaches, subscribed to by Cisco that can help any enterprise customer. Let’s find out how these methodologies can help you. How can Methodologies help you? The Wikipedia defines a methodology as: “the analysis…

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What is IP Subnet Zero? – Cisco Articles & Tips

I am sure you have used the Cisco IOS command show running-config before, and noticed a peculiar default command in the configuration. The command I am talking about is ip subnet-zero. Here is what I am talking about: But what is this command? Why is it there? Let’s find out. What is a zero subnet…

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How to Recover a Lost Password on a Cisco Switch

Lost the password to your Cisco switch? David Davis walks you through how to recover that password (and your sanity).

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How to Configure Passwords to Secure your Cisco Router

Maybe you have a new router or you want to verify that you have security properly configured on your existing router. Either way, password security is critical to properly securing your Cisco router. So let’s get started configuring passwords on your Cisco router. Types of Cisco Router Passwords When it comes to basic password security,…

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How to Configure Local Username Database in Cisco IOS

In this article, we will take a step further in securing our Cisco router by using a local username / password database in the Cisco IOS. Thus, a user must know a username AND password to be granted access to the Cisco IOS. Let’s see how this is done. Local Authentication The most basic level…

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Cisco CCNP Product Release

Cisco CCNP Training Videos – New Product Release Train Signal just released their Cisco CCNP CIT training course which is the final part of a four part series.  For those of you not familiar with Train Signal, their courses are very practical; designed to teach you “real world” skills and prepare you for certification exams. …

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Basics of Cisco Switch Administration – Part 2

Introduction In Basics of Cisco Switch Administration – Part 1, we covered some of the basics of Cisco switch administration – how to log in, how to show configuration, how to change interface speed & duplex, how to enable switch ports, and how to show switch port status. In Part 2, we will stick to…

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