Configuring Cisco routers
Could you give me some background information on how Cisco routers are configured?

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This document will give you basic information you'll need to configure your router for routing IP, such as how addresses are broken down and how subnetting works. You'll learn how to assign each interface on the router an IP address with a unique subnet. And don't worry, it has lots of examples to help tie everything together.
http://www.cisco.com/warp/public/701/3.html

Feature-by-feature router configurations

This was first published in September 2002