What type of traffic will a router not pass?

Routers are designed to forward packets between different IP networks, but they do not forward broadcast traffic. Broadcast traffic is meant for all devices on a given local network segment (LAN) and is sent to a broadcast address that all devices will listen to. Since routers typically connect different broadcast domains, they filter out broadcast packets to prevent them from traversing the network segments they control, thus preserving bandwidth and limiting broadcast traffic to individual LANs.

In a network environment, unicast traffic is directed to a specific device, multicast traffic is sent to a group of devices identified by a multicast address, and point-to-point traffic usually refers to a direct communication link between two devices. These types of traffic can be managed and routed appropriately by routers because they do not utilize the broadcast mechanism, which is restricted to a local network area. This ensures that routers effectively manage network performance and traffic flow without propagating broadcasts across distinct networks.