Interestingly, I was finding it hard to concentrate while studying and decided to do some random surfing when I came across an interesting little site
"Tons of network diagrams, large and small" enough to cause a brain seizure.
Check it out................
Just click on diagrams for larger/clearer view.
http://royal.pingdom.com/2008/06/24/impressive-home-networks/http://www.ratemynetworkdiagram.com/?i=1327
Interesting as the info was it sure did re-invigorate the mind for me to push on with studying. The info will certainly help with times when your imagination ceases to follow along with your course of study be it
Microsoft or
Cisco certifications. For the guys who work in and around IT departments I am sure you too will find it interesting, also for the guys who have yet to get there.

The download from this other link may be of some interest also:-
http://www.netquation.com/index.htmlhttp://www.networkdocumentation.com/index.php?option=com_docman&task=cat_view&gid=21&Itemid=37
I won't say much, but wait for feedback from you guys. It sure did help me with setting up several different configurations with my test labs.............