Internetworking Resources
Cisco Emulators
Dynamips - A Cisco 2600/3700/7200 Series Router Emulator.
Dynagen - A network configuration generator for Dynamips.
GNS3 - A graphical network simulator which allows for the simulation of complex networks. Uses Dynamips and Dynagen.
Interior Routing
Cisco Documentation - Routing Basics
BGP
BGP - The Movie (59.5MB MPG)
Renesys - Pakinstan Hijacks YouTube
Geoff Huston on Tubular Routing
Congestion Control
Van Jacobson's infamous Congestion Avoidance and Control paper (214KB PDF)