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Subnets & Routing

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What is a subnet?

A subnet (subnetwork) is a logical division of an IP network. Devices in the same subnet can communicate directly — devices in different subnets need a router.

Subnet masks define which part of an IP is the network and which is the device: - 192.168.1.10/24 — first 24 bits = network (192.168.1), last 8 bits = device (.10) - /24 = 254 usable host addresses

Packets in motion — click to inspect:

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