This blog post is the first of what may be a whole new type. You can read all day about Spanning Tree Protocol (STP), and learn the theory, but that’s not enough. When you later try to apply STP [...]

I’ve named a new type of blog post: an STP Puzzle. The big idea is pretty simple. The problem tells you some (but not all) facts about Spanning Tree Protocol (STP) in a small switched network. [...]

This blog post begins with a router triangle, IPv6 addresses, and working interfaces. All routers can ping their own IPv6 addresses, but the routers only know their own IPv6 connected routes. [...]

This blog post simply lists the answers to the earlier lab exercise from a few days ago. This post makes no sense without the first one, so don’t look until you read the other post. No guile, no [...]