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

A.
Brute force attack

B.
Ping of death

C.
Leapfrog attack

D.
Negative acknowledgement (NAK) attack

Explanation:
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.