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ISBN
Network Defense and Countermeasures 
9780789759962
Package: Student Edition for Network Defense and Countermeasures: Principles and Practices, Third Edition + One 1-year eText Access Code Card
9780135564592
Package: Student Edition for Network Defense and Countermeasures: Principles and Practices, Third Edition with Six 1-year eText Access Code Card
9780135499030
Network Defense and Countermeasures  eText 1-year access code
9780135581964
Network Defense and Countermeasures  eText six 1-year access code
9780135499092