What statement regarding denial-of-service (DoS) attacks is accurate?

a. A denial-of-service attack occurs when a MAC address is impersonated on the network.
b. A denial-of-service attack prevents legitimate users from accessing normal network resources.
c. A denial-of-service attack is generally a result of a disgruntled employee.
d. A denial-of-service attack is no longer a major concern due to the increased throughput available on most networks.

ANSWER: b