Having to learn networking

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.
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DoTheDEW335Connect With a Mentor Commented:
see if this info helps. lots of links and good info.

The equipment your using would help to give you some more appropriate resources.
That good enough?

Addresses must be unique, and LANs clearly defined, through subnetting. For security, block all ports to begin with and then open them one at a time. Might not be as intuitive with some VLAN. TraceRt is a nice command to learn, but probably you know that by now. It can be as good as if not better than <ping>
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