Offers a valuable dual perspective on security: how your network looks hackers who want to enter into, and how you should approach it in to keep them at bay. You get all the hands-on technical advice you need to succeed, but also the guidance of a higher level of administration to develop an effective security policy. + Helps you see through the eyes of a hacker so you can make your network more secure. + Provide technical advice that can be applied in any environment, on any platform, including help with intrusion detection systems, firewalls, encryption, anti-virus software, and digital certificates. + Emphasizing various administrative considerations, including security policies, user management, and control services and devices. + Includes techniques to improve the physical security system and your network. + Describes how to use information gathered to-hackers find and exploit security weaknesses. + Examine the most effective way to prevent hackers from gaining access to the server root. + Address Denial of Service attacks, "malware," and spoofing. + Includes appendix includes TCP / IP stack, the famous port, and a reliable source for security alerts and updates.