The document discusses trends in botnet and DDoS attacks based on a survey of service providers and analysis from Arbor Networks. Some key points:
- The size and frequency of DDoS attacks is increasing, with the largest attack observed reaching 24 Gbps in 2007. On average, there were over 1,000 attacks per day from 2006-2007.
- TCP attacks are most common, followed by UDP floods and application attacks. DNS amplification attacks have increased but remain less prevalent.
- Botnets are the top concern for service providers. They are used for DDoS attacks, spam, and hosting malware. New botnets are becoming more targeted, encrypted, and distributed.
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