Traditional firewalls served an important purpose for years, acting as a barrier to would-be attackers and offering some peace of mind to network administrators, but now the amount of traffic running on the application layer has increased, and hackers have gotten more savvy at co-opting it. A new generation of intrusion detection combines deep-packet inspection with malware detection, Web filtering and threat management. Most of these next-generation purchases today are replacing traditional firewalls, and will make up more than half of all firewall purchases by 2014, according to this article.

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