Denial of service (DoS)--particularly distributed denial of service (DDoS)--attacks have hit many enterprises recently, from Sony to Bank of America.
For years, most companies wrote off DoS attacks as an acceptable risk, because the probability of becoming a victim was relatively low and the risk of damage to the business was also low. Recently, however, this class of attack has increased in popularity, causing many organizations to rethink the relative risk. CEO's are concerned about lost revenue and bad press; IT frets over crashed applications and long work hours.