What Are Routers

Routers are networking devices that allow communication between networks. In many cases there maybe multiple routes to a destination network, the router makes decisions on which route to take based on it's metric. A routing metric is a set of parameters which a router checks against to determine which route to favour.
For example one route may pass through more networks on it's journey but have a shorter latency than another path. The metrics that a router uses depends partly on the routing protocol used, and what the administrator has configured.

Routers use logical addressing when making their routing decisions, and are located at the Network layer of the OSI model.

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