Intrusion prevention provides extra protection from viruses and hackers trying to enter a network. It controls access based on application content and is more secure than firewalls. Network and host-based systems are available, with content-based and speed-based options for network systems.
Intrusion prevention is a way to protect your computer system from unwanted access. Most computers have firewall programs installed to protect their systems from being exploited, but intrusion prevention is an added system for added security. An intrusion prevention system provides additional protection from computer viruses or hackers trying to enter your network.
Intrusion prevention systems are much more secure than common firewall technology. While considered an expansion of the original intrusion detection system, they’re actually more of a way to control who has access to a computer network. Not only do they audit access, but they also detect network access, so the two systems are closely related.
The intrusion prevention system controls access to a network based on the content of the application attempting to establish contact. Prior to this, detection from firewalls was based on ports or IP addresses. A good intrusion prevention system not only detects intrusions, but also controls access to a network. This last feature is the main system improvement over detection-only firewalls.
Different types of intrusion prevention are available for added security. Network intrusion prevention systems are usually hardware devices that are located on the network. Unlike host-based intrusion systems that need to be applied to all computers on the network, the network system requires fewer devices to be installed.
The network intrusion prevention system can be content-based or rate-based. A content-based system will inspect and prevent any entry from content that is not known. The content may not be recognized by the prevention system or may have previously been registered as a threat to your system.
Speed-based network intrusion prevention is based on the intent of the attack rather than the content. The speed-based system is able to identify threats that are different from the traffic the network normally receives. The speed-based system learns the type and behavior of normal network traffic and sets parameters accordingly. Anything that does not fall within these parameters will be prevented from accessing the network.
There are also host-based intrusion prevention systems. These are just software applications that are very good at detecting unwanted entry after decryption has occurred. Over time, the host-based system builds a monitoring system for computer network access. The only problem with host-based prevention is that it has to be installed on every computer on the network. It also cannot cope with higher rate-based access attacks, as it lacks the capabilities to handle these levels of access detection and denial.
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