How do I prevent DDOS attacks?

You cant really prevent ddos attacks, but their are various ways of reducing their effects on a network. Theres a good write up here: http://www.techrepublic.com/blog/security/ddos-attack-methods-and-how-to-prevent-or-mitigate-them/8523

Gotta laugh at people who spend all thier money on ddos mitigation.

All you need is someone with enough bandwidth and youll find out that indeed you don't have ddos protection.

Thank you, I was about to become a sucker too.

i have seen people get it with successful results but i don't think its really worth the money and you won't be invincible