A denial of service attack, or DOS attack, is an assault upon a network or web site that floods it with so many additional requests that regular services are either slow or completely interrupted.  In some instances, a group or remotely controlled, compromised desktops are combined to jointly attack a target system, this is known as a distributed denial of service.

Cyber Security Tips are provided by Multi-State Information Sharing and Analysis Center (MS-ISAC), http://www.msisac.org

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