Introduction

This book is the second volume of Cisco Network Admission Control from Cisco Press. The first volume, NAC Architecture and Design, examines the protocols used in NAC and covers each individual component's function in detail. Design guidance is provided to assist the reader in implementing NAC in an existing network infrastructure. This includes examining existing hardware and software to determine whether it is NAC capable, providing suggestions for logical enforcement points, and offering guidance on defining an admissions policy.

This book focuses on the key components that make up NAC and how one can successfully deploy and troubleshoot each component as well as the overall solution. Emphasis is placed on real-world deployment scenarios, and the reader is walked step by step through the individual component configurations. Along the way, best practices are called out along with mistakes to avoid. Component-level and solution-level troubleshooting techniques are also presented.

Three common deployment scenarios are covered in Part III, "Deployment Scenarios." They include a small business, a medium-size enterprise, and a large enterprise. Each topology builds on the previous one and adds additional components of NAC to the solution. The small business becomes the branch (or remote) office in the enterprise topologies, while the medium-size enterprise becomes a separate geographically located part of the large enterprise design. This approach also demonstrates how one can phase in NAC in any size network.

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