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rule base

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- In the context of a computer server acting as a firewall, a rule base is a set of rules that govern what is and what is not allowed through the firewall. A rule base can work in one of two ways: it can either explicitly assume that all traffic is allowed unless there is a rule to prevent it, or, more typically, it can assume that no traffic may flow through it unless there is an explicit rule to allow it. Rule bases usually work on a top-down principle in which the first rule in the list is acted upon first, so that traffic allowed by the first rule, will never be judged by the remainder of the rules. Rule bases typically have the format of SOURCE / DESTINATION / SERVICE / ACTION.

Learn more about Network Security Best Practices and Products

Integrating NAC with network security tools: Integrating NAC solutions with other network security functions can produce a more complete user identity to strengthen every policy across the network.
How to evaluate and manage UTM for network security: Find out what issues to consider for evaluating and managing unified threat management (UTM) devices for network security.
How does a firewall work?: Learn more about firewalls and how they work in this guide.
Build Your Own Security Lab: Securing Wireless Systems: Learn wireless networking basics and methods used to attack and secure wireless systems in Chapter 9 of 'Build Your Own Security Lab,' Securing Wireless Systems.
Securing the new network architecture: In modern networks, security is less about locking down a perimeter and more about controlling access and behavior and ensuring data safety in a dynamic and mobile environment.

CONTRIBUTORS:	Nick Brown
LAST UPDATED:	16 Apr 2007

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