|  | 11.7 | ARP Tables
| 11.7.1 | Internetworking devices that have ARP tables

You have learned that the port, or interface, where a router connects to a network, is considered part of that network; therefore, the router interface connected to the network has an IP address for that network. Routers, just like every other device on the network, send and receive data on the network, and build ARP tables that map IP addresses to MAC addresses.