Subnetting

Subnet masks, CIDR notation, IP address formats, and advanced techniques like VLSM and supernetting.

VLSM and Supernetting: Advanced Subnetting Techniques

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TL;DR — The Short Version VLSM (Variable Length Subnet Mask) divides a network into subnets of different sizes, matching each subnet to actual host requirements. Fixed-length subnetting (FLSM) wastes addresses by forcing every subnet to be the same size. Supernetting (route aggregation) is the reverse: combining contiguous networks into one larger block to shrink routing … Read more

Subnetting Made Simple: A Beginner’s Guide to CIDR Notation

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TL;DR — The Short Version Subnetting divides a large network into smaller, more manageable segments for better security, performance, and organization. A subnet mask tells you which bits of an IP address identify the network and which identify individual hosts. CIDR notation (like /24) is shorthand for how many bits belong to the network portion … Read more

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