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Denial-of-Service (DoS) attack is a cyber-attack in which the services of a target are made unavailable to legitimate users through using a computer with multiple IP addresses or multiple computers in different locations to repeatedly make phoney requests from the target. This overloads the target, ties it up and prevents it from attending to requests from legitimate users. DoS attacks flood the target with heavy traffic until it can no longer function again. The attack can last up to months in extreme cases and definitely will cost businesses and organisations time and money.