Network Design — Keeping it simple
Since the dawn of time people have skirted best practice and banged together networks, putting the proverbial square peg in the esoteric round hole.
Best-Practices
Best Practices and Securing Cisco IOS
Everyone has different views on hardening IOS, and while I do not claim to be an expert, these are the practices that I commonly use when bringing up a new device.
BGP Security Tips (updated)
For some, BGP is a rather large obtrusive beast of a protocol that scares them half to death.