Final answer:
The statement claiming that a denial-of-service attack is a passive attack is false; it is actually an active attack that disrupts services by overwhelming them with traffic.
Step-by-step explanation:
The statement that 'denial-of-service attack is a passive attack' is False. A denial-of-service (DoS) attack is considered an active attack because it attempts to disrupt the normal functioning of a service or network by flooding it with excessive traffic or sending information that triggers a crash.
In contrast, passive attacks involve monitoring or eavesdropping on communications without disrupting the system's normal operations. Therefore, to correct the statement: 'A denial-of-service attack is an active attack aimed at disrupting service availability.'