Variable Length Subnet Masking

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Reading through my CCNA study book and I have kind of run up against this subject and seem to be a bit (OK then very!) stuck. Does anyone here know of any internet resources where I could try to get a grip on this topic?

I have already had a bit of a google and drawn a blank so far.

Thanks

 

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Did you check out http://www.learntosubnet.com

They have some really helpful stuff including videos regarding subnetting.

And one I picked up recently here from Tripwire (thanks) http://www.subnetonline.com/

Pete