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David Chapman, CISSP-ISSAP, CCSP, is an independent information security consultant specializing in vulnerability assessments, penetration testing, and the design and implementation of secure network infrastructures. His protocol expertise includes TCP/IP, IPSec, 802.11 wireless, BGP, IPX, SNA, AppleTalk, Frame Relay, PPP, HDLC, LLC, and NetBIOS/SMB.