Passed Network+ 2005, buy books for 2009 to keep up to date?

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First of all, I've no intention of sitting the latest version of the exam.

But I was wondering whether I should buy some of the books for the latest version of the exam to keep up to date?

Or should I use my existing books, ignore the obsolete technology (bus topology?) and concentrate on TCP/IP?

 

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You generally keep "up to date" by working in the field. ;)