Router Overview
■ Router Features

How a Router Works
■ Keeping the Message Moving

Packets and Paths
■ Transmitting Packets
■ The Path of a Packet
■ Routing Packets
■ Knowing Where to Send Data

Addresses
■ Logical Addresses
■ MAC Addresses

Router Hardware and Memory
■ WAN Interfaces
■ Router Memory

Router Ports and Modules

Understanding the Protocol

Security
■ Denial of Service Attacks

Backbone of the Internet

Lots More Information
■ Cisco Routers
■ Comparison of Routers