Practical Networking .net
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Cisco IP SLA — Using a Cisco Router to generate traffic

Recently, I got a chance to play around with some features of Cisco IP SLA and wanted to share a few things I learned. Namely, how to use a Cisco Router to generate simple traffic for testing. In the past, I had only used this feature to send a few pings to test connectivity to […]

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Route Precedence — How does a Router choose its preferred path?

Whenever possible, Routers should have multiple paths (or routes) to get to a target network — this is a key component for network resiliency. Which means Routers routinely compare routes to choose one preferred path among multiple that may exist. The Route Precedence process is accomplished by comparing three different attributes. This video steps through […]

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Classful vs CIDR vs FLSM vs VLSM

These four terms all refer to somewhat overlapping concepts. As a result, some confusion has surfaced about what each of these terms actually mean, and how they differ from each other. That is what this article is going to pick apart. These four terms can be broken up into two sets of two terms: Classful […]

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VLANs – the simplest explanation

I just released a new videos which teaches VLANs in the absolute simplest way. This is how I wish VLANs were taught to me when I first started my Networking journey. I have since taught countless students using this format, and the reception has been unanimously positive. Now I’m sharing that method with my readers! […]

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FLSM and VLSM – Part 2

I’ve just completed Part 2 of the VLSM and FLSM extensions of the Subnetting Mastery video series. The series now, more than ever, covers everything anyone would ever need to know about Subnetting. The series runs you through an example VLSM (Variable Length Subnet Mask) problem. You are given the 9.9.9.0/24 network and tasked to […]

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FLSM and VLSM – Part 1

After many requests to extend the Subnetting Mastery video series, I am adding an appendix which will cover Fixed Length Subnet Masks (FLSM) and Variable Length Subnet Masks (VLSM). This is Part 1, which teaches how to answer questions of this variety: If you start with a /18, what size sub-network would you need to […]

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Voice VLAN – Auxiliary VLAN

The terms Voice VLAN or Auxiliary VLAN typically mean the same thing: They are a feature which allows an access port — which normally only accepts untagged traffic for a single VLAN — to also accept tagged traffic for a second VLAN. But that is merely the “what”, and if you were simply looking for […]

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Converged Network

In the early days of Networking, a computer network was meant to carry only data traffic. As time went on, VOIP, or Voice-Over-IP technologies were invented, computer networks had to be designed to also carry Voice traffic. When a single network fabric is carrying both Data traffic and Voice traffic, it is referred to as […]