When computer hackers attempt to shut down a network operation by overloading a system, it is referred to as:

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Denial of service (DoS) is a type of cyber attack where a hacker overloads a system with requests or traffic to the point where it becomes unable to operate properly. This can lead to a network shutdown or slowdown, preventing legitimate users from accessing the system. Denial of entry and log on denial are not commonly used terms in cyber security, and denial of system activation does not accurately describe this type of attack.

When Computer Hackers Attempt to Shut Down a Network Operation