I have just finished teaching a couple of CompTIA Network+ classes. One of the subject matter areas that most students struggle with is the concepts around Subnetting, Supernetting, Variable Length Subnet Masking (VSLM), Fixed Length Subnet Masking (FLSM), Classless Interdomain Routing (CIDR),
I recently found this collection of ten videos presented by Practical Networking. These excellent guides will tell you everything you need to learn about networking addressing concepts. Even if your career focus is
These videos can help you to pass a number of certification exams, starting with CompTIA’s IT Fundamentals, A+ Core 1 and Core 2, Network+, and several Cisco certifications, such as the CCNA and CCNP, and even cybersecurity certifications such as CISSP, CASP+, and Security+.
Subnetting Mastery Video Series from Practical Networking
This video series will teach you everything you need to know about Subnetting.
To maximize your retention, it is recommended to watch these videos in order, and take a quick practice break after video 4, video 5, and video 7.In
Video 1, you will learn the basics of subnetting. Every Subnetting problem will ask you to solve for one or more of seven possible attributes. This video explains what each of the attributes are.
In Video 2 of the series, we will show you how to draw the ultimate Subnetting Cheat Sheet. The rest of the videos in this series will show you how to use this Cheat Sheet to answer any subnetting problem in 60 seconds or less.
In Video 3, we will show you how to use the Subnetting Cheat Sheet to solve for all seven attributes of Subnetting (explored in video 1) in 60 seconds or less.
In Video 4 there are four more practice problems to provide further demonstrations of the method and cheat sheet. The first two problems are fairly straight forward. The second two demonstrate a couple specific peculiarities you might encounter in the real world.
In Video 5, we will show you four tricks that will help you solve subnetting problems even faster. With the speed tips in this video, and a little practice, it won’t be unreasonable to be able to solve subnetting questions in as little as 10 seconds.
In Video 6, we show you how to extend the Subnetting Cheat Sheet to allow you to solve problems in the /17-/24 range just as easily as the /25-/32 range.
In Video 7, we show you how to extend the Subnetting Cheat Sheet to allow you to solve problems in the /1-/16 range.
In Part 1 of the FLSM and VLSM Appendix, we explain the Network Doubling logic, and use it to show you how to solve two types of FLSM questions. Then we illustrate 2^N notation, and demonstrate how to use it to answer FLSM questions quickly.
In Part 2 of the FLSM and VLSM Appendix, we unpack Variable Length Subnet Mask questions, and illustrate how to solve them. We then step through a series of examples using VLSM to assign IP addresses to a network.
Supernetting involves taking multiple subnets or IP addresses and aggregating them into a single Network. This video illustrates and discusses the process, and shows you how to solve summarization problems quickly and accurately. The terms Supernetting, IP Aggregation, and IP Summarization are all interchangeable.
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Want to learn the core of networking: How Data flows through a network? Check out the Networking Fundamentals video series