According to Wikipedia, "A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. It normally consists of the concerted efforts of a person or people to prevent an Internet site or service from functioning efficiently or at all, temporarily or indefinitely. Perpetrators of DoS attacks typically target sites or services hosted on high-profile web servers such as banks, credit card payment gateways, and even root nameservers."

DDoS attacks can be mechanized so the identity of the attackers remains untraced. Most common DDoS attacks are TCP SYN Flood Attack, teardrop attacks, Smurf IP Attack, UDP Flood Attack, ICMP Flood Attack and peer-to-peer.

Standard sufferers for DDoS attacks are online businesses, carriers and service providers. DoS attacks aim revenue generating organizations by overtaxing link competence. This outlays them both direct and indirect damages. Direct damages include revenue loss or increased network costs. Indirect damages are related to business reputation and increased operational expenses.

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The NetandHost - DDoS mitigator's filtering system blocks almost all deceptive traffic and ensures that valid traffic is allowed up to the largest extent possible. These systems have seamlessly protected several web sites from large service outages caused by simultaneous attacks as large as 300+ Mbps in the past, thus allowing organizations to focus on their Business.