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By Sean Convery, and Bernie Trudel

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The authors are not proposing that any designer would implement this architecture verbatim, but would encourage designers to make educated choices about network security grounded in this proven implementation. Cisco Systems Copyright © 2000 Cisco Systems, Inc. All Rights Reserved. Page 36 of 66 Migration Strategies SAFE is a guide for implementing security on the enterprise network. It is not meant to serve as a security policy for any enterprise networks, nor is it meant to serve as the all-encompassing design for providing full security for all existing networks.

The firewall should block this path in order to limit the options of hackers if they had control of one of the Web servers. As the user navigates the Web site, certain link selections cause the Web server to initiate a request to the application server on the inside interface. This connection must be permitted by the first firewall, as well as the associated return traffic. As in the case with the Web server, there is no reason for the application server to initiate a connection to the Web server or even out to the Internet.

Page 56 of 66 original architects of the Internet never anticipated the kind of widespread adoption the Internet has achieved today. As a result, in the early days of the Internet Protocol (IP), security was not designed into the specification. For this reason, most IP implementations are inherently insecure. Only after many years and thousands of Requests for Comments (RFCs), do we have the tools to begin to deploy IP securely. Because specific provisions for IP security were not designed from the onset, it is important to augment IP implementations with network security practices, services, and products to mitigate the inherent risks of the Internet Protocol.

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A Security Blueprint for Enterprise Networks by Sean Convery, and Bernie Trudel

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