- Packet Tracer is a program used to illustrate basic network concepts and allow users to build and test networks in real-time.
- A router is a networking device that connects different networks and selects the best path to forward packets between them based on its routing table. Cisco is the leading manufacturer of routers.
- There are different modes that allow administrators to monitor and configure routers, including setup, user, privileged, global configuration, and interface modes. Static and dynamic routing can be configured to determine the best paths between networks.