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A Denial-of-Service (DoS) is an attack whose purpose isn't to break into a system, but instead to simply "deny" anybody else from using the system. Types of DoS attacks: - crash
- Tries to crash software running on the system, or crash the entire machine.
- disconnect
- Tries to disconnect two systems from communicating with each other, or disconnect the system from the network entirely.
- slow
- Tries to slow down the system or its network connection.
- hang
- Tries to make the system go into an infinite loop. If a system crashes, it often restarts, but if it "hangs", it will stay like that until an administrator manually stops and restarts it.
DoS attacks can be used as part of other attacks. For example, in order to hijack a TCP connection, the machine you are taking of the place of must first be taken offline with DoS. By some estimates, DoS attacks like smurf and the massive DDoS attacks account for more than half the traffic accross Internet backbones.
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