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The type of criteria used to determine whether traffic should be allowed through varies from one type to another.
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The following image depicts a firewall installation in the network.įirewalls are a set of tools that monitors the flow of traffic between networks. For example, a firewall may filter all incoming packets destined for a specific host or a specific server such as HTTP, or it can be used to deny access to a specific host or a service in the organization. It is designed to forward some packets and filter others. What is a firewall?Ī firewall is a device installed between the internal network of an organization and the rest of the network. This article describes the importance of intrusion detection and prevention and why they must be a part of every network security administrator’s defense plan.
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