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Supernetting, IP Aggregation, and IP Summarization

Supernetting is something like the inverse of Subnetting. With Subnetting, you take one Network and divide it into multiple sub-networks (subnets). With Supernetting, you are doing the opposite: you take multiple subnets and aggregating them into a single Network. Supernetting is synonymous to the terms IP Aggregation and IP Summarization. Often, training explicitly on Supernetting […]

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Local Broadcast vs Directed Broadcast

Two types of Broadcast IP addresses exist: the Local Broadcast IP address and the Directed Broadcast IP address. In the current networking world, they mostly serve the same function. But one of them contains an additionally piece of functionality. In this article we’ll clearly illustrate both concepts, and show you their functionality. We’re going to […]

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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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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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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 […]

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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 […]