I'm a Jr Network Administrator at my company. I've been here for about 3.5 months and have been doing some tier 1-2 work. Our senior guy left and now I find myself being thrust into a much higher level of work than I am skilled in. The senior guy had something of a mess with our network. We have VLANs that aren't being used and data making multiple trips the the same switch to get to the internet. What I'm after is some good resource on the internet that gives me some help trying to understand switching, routing and VLANs. Any help would be greatly appreciated.