Guide to Firewalls & VPNs /
Guide to Firewalls & VPNs / Michael E. Whitman, Herbert J. v Mattord, Andrew Green. - international ed. - Canada: Cengage Learning, 2012. - 346 p. : ill. ; 24 cm.
9781111308483
Computer networks -- Security measures.
TK5105.59 / .W535 2012