Joe Casad is an engineer who has written widely on computer networking and system administration. He is the editor-in-chief of C/C++ Users Journal, technical editor of SysAdmin Magazine, and senior editor of UnixReview.com. His previous books include Sams Teach Yourself TCP/IP in 24 Hours, Second Edition, MCSE Windows NT Server and Workstation Study Guide, MCSE Networking Essentials Training Guide, Windows NT Server 4.0 Professional Reference, Windows 98 Professional Reference, and Network Professional's Library: Active Directory.