In all areas of IT, there are a number of situations where certain ways of presenting data, configuration details, or a sequence of events work best. We often tend to rely on one tool for everything because we're familiar with it, but that isn't always the best approach. Here is my top 10 list of the most effective ways to visually represent IT data.
1: Network connectivity -- Microsoft Visio
I'll admit that one of my nicknames over the years has been "Kid Visio." Visio is a capable tool for documenting network connectivity. It's not the right tool for documenting the configuration, but it does a good job of outlining the logical layout. From a top-down perspective, I feel Visio does this best. This figure shows a sample network diagram that clearly shows the logical layout of the network.