Need to teach myself VTP- buy cisco router or books?

Im going for a networking job with a deadline next in one month. One requirement is some experience/ knowledge of VTP. Im considering buying a used cisco router on ebay. My question is would it be more impressive to a possibe interviewer if I was to obtain a router and tinker with it and learn what I need to know. Any suggestions on model numbers would be appreciated. Or is it better to use the web and some books. Hope this makes sense- this is the end of a very long day. Thanx in advance.
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so get busy in the lab with the switches