Router
A layer-3 device that forwards packets between networks based on IP routing tables.
A router forwards packets between networks at layer 3 using IP routing tables. ACLs on a router give coarse, stateless filtering, while stateful, application-aware policy belongs on a firewall. Misconfigured or unauthenticated routing protocols (BGP, OSPF) cause both major outages and route hijacks that redirect or intercept traffic.
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