This practical guide to network security shows how many threats can be countered with good procedures, simple technology and easily available hardware and software. It identifies potential weaknesses in and threats to your network, and describes and evaluates the range of available tools that can secure it. Clearly written and concise, the book helps you focus on key areas of vulnerability; aids you in the selection of the right tools for the job; assists you to design, develop and manage your network in a more secure way; and guides you when making decisions about commercially available security products.