A lot of DDOS attacks use UDP-based amplification techniques. I know DNS and NTP were frequently used and could get amplification factors of up to 500x. This

A lot of DDOS attacks use UDP-based amplification techniques. I know DNS and NTP were frequently used and could get amplification factors of up to 500x. This year there have been some amplification attacked using Memcache that could get 50,000x amplification.