Just a few short years ago, an IDS was a luxury. Before the rise of the Web application and the worm, most networks were adequately defended by a firewall at the perimeter and a virus scanner at the mail server. Today, the firewall remains effective against clumsy DoS attacks and run-of-the-mill exploits, but it’s hard-pressed to thwart application-layer attacks that piggyback on welcome protocols and worms that wind their way inside the network through any overlooked port or a mobile user’s laptop.

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