I started working for a university this past week. This is only the second enterprise level network I have worked with and they are several years apart. I want to get up to speed on vlan's and trunking...tagging and untagging. I need a real understanding of this as there are thousands of VLAN's in use on the network. I also am looking for a discovery tool that can search across the network and identify our switches/routers and servers. The documentation is very poor and I want to get a grasp on this ASAP. Any feedback is appreciated!