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An intrusion prevention system (a computer security term) is any device which exercises access control to protect computers from exploitation. "Intrusion prevention" technology is considered by some to be an extension of intrusion detection (IDS) technology, but it is actually another form of access control, like an application layer firewall.
Intrusion prevention systems were invented independently by Jed Haile and Vern Paxon to resolve ambiguities in passive network montoring by placing detection systems in-line. A considerable improvement upon firewall technologies, IPS make access control decisions based on application content, rather than IP address or ports as traditional firewalls had done. Some time later IPS was commercialized by One Secure which was eventually acquired by NetScreen Technologies which was in turn acquired by Juniper Networks in 2004. As IPS systems were originally a literal extension of intrusion detection systems, they continue to be related.
Intrusion prevention systems may also act at the host level to deny potentially malicious activity.
An Intrusion Prevention system must also be a very good Intrusion Detection system to enable a low rate of false positives.
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