New PDF release: Cisco PIX Firewalls: Configure, Manage, & Troubleshoot

By Charles Riley (Editor), Visit Amazon's Umer Khan Page, search results, Learn about Author Central, Umer Khan, , Michael Sweeney

Umer Khan's first ebook, "Cisco defense Specialist's advisor to photos Firewalls," ISBN: 1931836639, constantly maintained its spot because the number one best-selling snap shots e-book on amazon.com by way of delivering readers with a transparent, accomplished, and self sufficient creation to portraits Firewall configuration. With the marketplace for snap shots Firewalls conserving double digit development and several other significant improvements to either the snap shots Firewall and VPN customer product strains, this ebook can have huge, immense attraction with the viewers already accustomed to his first publication. * The Cisco images firewall is the number 1 marketplace top firewall, possessing forty three% marketplace percentage. Cisco published thoroughly re-designed model 7 of the graphics working method within the first region of 2004. * "Cisco graphics Firewalls: configure | deal with | troubleshoot" covers all goals at the new Cisco photographs certification examination, making this publication the correct examine advisor as well as specialist reference.

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Extra info for Cisco PIX Firewalls: Configure, Manage, & Troubleshoot

Sample text

Pdf (800-40 is the document number). qxd 5/6/05 12:40 PM Page 13 Introduction to Security and Firewalls • Chapter 1 might improve security—for example, by deploying additional firewalls internally or on your network perimeter. Monitoring Activity As you make efforts to secure your environment, you move into the next phase of information security: establishing better mechanisms for monitoring activity on your network and systems. Adequate monitoring is essential so that you can be alerted, for example, when a security breach has occurred, when internal users are trying to exceed their authority, or when hardware or software failures are having an impact on system availability.

However, firewalls are just one component in an enterprise security strategy. They are generally good at what they do (filtering traffic), but they cannot do everything. The nature of perimeter security has also changed; many companies no longer need outbound-only traffic. Many enterprises now deal with much more complex environments that include business partner connections, VPNs, and complicated e-commerce infrastructures. This complexity has driven huge increases in firewall functionality. 323 for videoconferencing.

By renumbering their private networks with these reserved address ranges, companies could potentially return their allocated public blocks for use elsewhere, thus extending the useful life of IP v4. The sharp reader, however, will point out that if these addresses are not routable on the Internet, how does one on a private network access the Web? This is where Network Address Translation (NAT), defined in RFC 1631, comes into play. This serves as a basic security measure that can make it a bit more difficult for an external attacker to map out the internal network.

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