The past couple of years have seen a marked resurgence of denial of service (DoS) attacks. Not only is this availability-threatening class of attack firmly back on the radar screens of today’s network and security operations teams, but the nature of the threat has changed as well. The largest Internet companies are no longer the primary targets. Now every business, regardless of size or industry segment, is at risk. Detecting these attacks is also much harder than in the past, as stealthy, lowbandwidth application layer variants focused on exhausting backend resources join the ever-familiar, high-volume attacks intended to flood network pipes or knock over critical network devices/services.

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