Which device forwards IP packets between multiple distinct IP networks?

Concept

Network devices are distinguished by the addressing information they use and the scope across which they forward traffic.

A router works at the network layer: it reads destination IP addresses and uses a routing table to forward packets from one IP network to another.

Application

The stem asks for a device that connects multiple distinct networks, so the required function is inter-network packet forwarding.

Contrast

• A switch forwards Ethernet frames between ports within a LAN by using MAC addresses.

• A hub repeats incoming bit signals to every other port within one shared segment.

• A router forwards IP packets between distinct networks by using destination addresses and a routing table.

• A bridge forwards or filters Ethernet frames between LAN segments by using MAC addresses.

Cross-check

When a host sends data to a destination outside its local subnet, it sends the packet to its default gateway; that router selects a route toward the destination network.

Therefore, the required device is a router.