Practical Networking .net
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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 […]

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What is the Native VLAN?

The Native VLAN is an oft confused concept, though it needn’t be. This video will explain what the Native VLAN is and how it affects traffic on a wire. Summary An Access port (or “untagged port” in the non Cisco world) is a switch port which carries traffic for only one VLAN. A Trunk port […]

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Subnetting Mastery

Lately I’ve been working on a Subnetting Mastery video series. The goal is take someone with little to no exposure to subnetting and make them a subnetting pro. I’m happy to announce that the video series is finally complete! If anyone is working through or trying to learn subnetting, this is the video series for […]