VIDEO 2 – SUBNETTING CONCEPTS

This is NOT actual subnetting (per se), but you need to understand the CONCEPT of subnetting to really “get” the process. That’s what we’re doing in this video

VIDEO 3 – IP “CLASSES” IN SUBNETTING

When subnetting was first used, you had to stick with “classes” whereby the IP address was divided by the subnet mask ON the decimals. After Variable-Length Subnet Masks were devised (next video down), having or using “Classful” subnet masks was no longer necessary. But understand how many hosts and networks (subnetworks) are available for use within each Class.

VIDEO 4 – “AND-ing” THE IP ADDRESS AND SUBNET MASK TOGETHER

To determine the basic (starting) network address for a subnet(sub-network), as well as the broadcast address for that subnet and all the host addresses in between that can be used, you need to AND the IP Address and the Subnet Mask together.

VIDEO 5 – VARIABLE-LENGTH (CLASSLESS) SUBNETTING

Without being restricted to CLASS-ful subnetting, most devices (switches and routers) can now recognize and use Variable-Length Subnets, which are NOT restricted to being divided on the decimal like Class-ful subnets have to be. Variable-Length Subnet Masks allow us to “fine-tune” our number of subnets and hosts in each subnet.

VIDEO 6 – SUPER-netting

To make it easier for routers learning routes on networks (with Dynamic Routing like RIP, BGP, IGRP), we can have 1 overall summerized subnet that encompasses multiple other subnets. We call this “Supernetting”

THE CHEAT SHEET

How to solve ANY subnetting question or scenario IN 7 SECONDS!