Learn the essentials of computer and network security while getting complete coverage of all the objectives for CompTIA's Security+ certification exam, plus coverage of the (ISC)2 SSCP certification, which focuses on best practices, roles, and responsibilities of security experts. Written and edited by leaders in the IT security field, this text explains the fundamentals of communication, infrastructure, and operational security. You'll also get details on methods to defend your computer systems and networks and how to prevent attacks.