Arbor Networks’ 7th annual Worldwide Infrastructure Security Report presents a view of 2011 security through the eyes of the providers: ISPs, hosting companies, and service providers. “Ideology was the most common factor for DDoS in 2011,” it notes, “followed by a desire to vandalize.” Since we have seen hacktivists willing to issue a general ‘call to arms’ and even provide the tools to take part in attacks, it represents, concludes Arbor, ‘a sea-change in the risk-assessment model’ for both network operators and their customers.