Routers, Switches, Bridges, Hubs

Router

This device breaks up collision domains and broadcast domains

Router

This device can measure the distance to a remote network

Hub

This device can never be run full-duplex

Bridge or Switch

This device creates many smaller collision domains, but the network is still one large broadcast domain

Hub

This device creates one collision domain and one broadcast domain

Router

This device sends and receives information about the Network Layer

Bridge or Switch

Uses hardware addresses to filter a network