Cisco Systems now holds over 80 percent of the Internet infrastructure. This text is an entry-point for the IT professional who is still unfamiliar with the way in which Cisco operates. It provides a fundamental overview of the subject and should be read before the certification study guides.

�ber die Autorin bzw. den Autor

Tom Shaughnessy (Bloomington, MN) is a consultant for VelteSystems, an enterprise network consulting firm. He has more than 17 years of computer industry experience.

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