Although relatively unsophisticated, distributed denial of service attacks (DDoS) are fairly difficult to defend against.  The basic concept behind a DDoS attack is simply to flood a victim’s Internet service with enough inbound traffic that legitimate traffic cannot get through or the service cannot respond. 

Unlike a DoS attack where there is only one computer used to flood the victim’s server, a DDoS uses large numbers of computers on a large number of different Internet connections, often distributed globally via a botnet.  This distribution of attack is what makes a DDoS so challenging to defend against, made particularly more difficult when the DDoS attack is made up of legitimate looking traffic – just an overwhelming amount of it.

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