Cisco routers are used to interconnect two or more computer networks and selectively interchange packets of data between them. It is a networking device whose software and hardware are customized to the tasks of routing and forwarding information. A cisco router has two or more interfaces. Each router interface is a small computer specialized to convert electric signals from one form to another.
Cisco routers – Data packets contain information
Cisco routers data packets contain address information which routers determine if the source and the destination are on a shared network. When info related to target system addresses is needed multiple cisco routers are used.