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Which of the following results in a denial-of-service attack?

Brute force attack

Ping of death

Leapfrog attack

Negative acknowledgement (NAK) attack

The use of Ping with a packet size higher than 65 KB and no fragmentation flag on will cause a
denial of service. A brute force attack is typically a text attack that exhausts all possible key
combinations. A leapfrog attack, the act of telneting through one or more hosts to preclude a trace,
makes use of user ID and password information obtained illicitly from one host to compromise
another host. A negative acknowledgement attack is a penetration technique that capitalizes on a
potential weakness in an operating system that does not handle asynchronous interrupts properly,
leaving the system in an unprotected state during such interrupts.

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