Practical Networking .net
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Discontiguous Wildcard Masks

If you’ve been doing Networking, then you are probably familiar with CIDR notation, and how it correlates to Subnet Masks and Wildcard Masks. Which means you know that a /26 correlates to a Subnet Mask of 255.255.255.192 and a Wildcard Mask of 0.0.0.63. But what is the purpose of a Wildcard Mask if you already […]

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Full CCNA Course by Neil Anderson

I get many requests for a full CCNA exam course. And while the idea has some appeal, I currently have no plans to produce my own CCNA training course at this time. However, I did want to provide you all with my recommendation for a CCNA course: Neil Anderson’s CCNA Boot Camp course. There are […]

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Wildcard Masks

If you understand Subnetting, then you probably know that the CIDR notation of /24 correlates to the Subnet Mask of 255.255.255.0. But did you also know both of those correlate to the Wildcard Mask of 0.0.0.255? This video picks apart Wildard Masks, what they are, and how they are used. We’ll cover the following concepts: […]

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Binary Numbers — Counting and Converting

Binary numbers, ones and zeros — the language of computers. The entire Network Engineering industry can be diluted to having a goal of simply carrying those ones and zeros between two computers. In this video, I talk through the concepts of Binary numbers, how to count in Binary, and how to convert between Binary and […]

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NAT on Cisco ASA and ASAx Firewalls – Udemy Course

I just published my second course on Udemy. This one covers the full depth of how to configure and verify Network Address Translation on Cisco ASA and Cisco ASAx Firewalls. This course has three modules: The first module will teach you Everything there is to know about Network Address Translation: Why it exists, How it it works, […]

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NAT on Cisco IOS Routers – Udemy Course

Hey everyone. I published my first course on Udemy. You can access it at a discount with this link: This course has two modules: The first module will teach you Everything there is to know about Network Address Translation: Why it exists, How it it works, What happens to packets as they get translated. This module […]

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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 mock traffic for testing. In the past, I had only used this feature to send a few pings to test connectivity and/or […]

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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 […]