I’m liking Cisco’s Packet Tracer tool- there’s a huge difference between learning these concepts in a book or by watching a video, and actually (virtually) configuring a wireless router and being able to create a simulation where packets flow between a client and a public IP server. In one of today’s exercises, I ran that simulation and was able to look at the packets flowing in and out of the network. The tool showed what was happening on each of the OSI layers and also exploded the packets to show headers and such. Cool stuff!