What Is a Subnet?
A logical division of a network determined by a subnet mask.
Definition
Subnets divide IP ranges into smaller groups to improve organization, routing, and security.
Common Subnets
/24 → 256 addresses /25 → 128 addresses /26 → 64 addresses
Why It Matters
Subnetting controls traffic flow, prevents collision domains, and isolates groups of devices.
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