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By Robert Shimonski; et al

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The DMZ is a critical segment found in many networks (any network that has a WAN link or Internet connection could build a DMZ). We think that you’ll find this book your one-stop guide to planning, designing, deploying, and maintaining a secure and viable DMZ segment on your production network. —Robert J. qxd 2 6/3/03 5:08 PM Page 2 Chapter 1 • DMZ Concepts, Layout, and Conceptual Design Introduction During the course of the last few years, it has become increasingly evident that there is a pronounced need for protection of internal networks from the outside world.

As machine technologies have improved and extensive shifts in the functions that a user can accomplish through more user-friendly interfaces have occurred, many more attacks have been mounted against enterprise and nonenterprise systems. Unlike the patterns in the past, when networks were primarily attacked and probed by “professional” attackers, the systems you protect are now routinely scanned by individuals and groups ranging from pre-teens “just trying it out” to organized groups of criminals seeking to abridge your systems or utilize information that is stored within your enterprise that can give them identities, disclose trade information, allow them access to funds, or disrupt critical services that your organization provides.

By the same token, you want to tightly control who and what type of access is allowed to enter the private protected network. qxd xxxii 6/5/03 11:55 AM Page xxxii Foreword services running on the DMZ and around it), and a highly skilled security analyst (to harden and test the DMZ segment). Due to the need for such a diverse skill set, it is common for most companies to have a team of designers and even some consultants perform this work. With this book, all that changes—and we believe it is long overdue.

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