Howstuffworks "How Routers Work" - Routers are such a vital component of the Internet that the Internet literally could not exist without them. Find out exactly how routers work and why they are so important!
Interior Gateway Protocols - Tutorial slide presentation on interior routing protocols like RIP and OSPF.
Internetwork Design Guide - This publication provides internetworking design and implementation information and helps you identify and implement practical internetworking strategies that are both flexible and scalable
Introduction to LAN Protocols - This document introduces the various media+access methods, transmission methods, topologies, and devices used in a local+area network (LAN).
Overview of Routing between Virtual LANs - This document provides an overview of virtual LANs (VLANs). It describes the encapsulation protocols used for routing between VLANs and provides some basic information about designing VLANs.