The best-selling first edition of Firewalls and Internet Security became the bible of Internet security by showing readers how to think about threats and solutions. The completely updated and expanded second edition defines the security problems students face in today's Internet, identifies the weaknesses of the most popular security technologies, and illustrates the ins and outs of deploying an effective firewall. Students learn how to plan and execute a security strategy that allows easy access to Internet services while defeating even the wiliest of hackers. Written by well-known senior researchers at AT&T Bell Labs, Lumeta, and Johns Hopkins University the students will benefit from the actual, real-world experiences of the authors maintaining, improving, and redesigning AT&T's Internet gateway.