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Most of Cisco Press puts me to sleep after a few pages, ccna 200 301 voucher but on the shelf or desk of just about every network engineer I work with is a copy of Routing TCP/IP, Volume 1 (1st Edition).  That title seemed to be the defacto standard for all network engineers, and even some engineers that weren't network engineers, so I decided to pick up a copy only to be surprised that it had been updated with a second edition.   ccna 200 301 voucher