Mike, a security professional, is tasked with actively verifying the strength of the security controls on a
company’s live modem pool. Which of the following activities is MOST appropriate?
War dialing is a technique of using a modem to automatically scan a list of telephone numbers, usually dialing
every number in a local area code to search for computers, Bulletin board systems and fax machines. Hackers
use the resulting lists for various purposes: hobbyists for exploration, and crackers – malicious hackers whospecialize in computer security – for guessing user accounts (by capturing voicemail greetings), or locating
modems that might provide an entry-point into computer or other electronic systems. It may also be used by
security personnel, for example, to detect unauthorized devices, such as modems or faxes, on a company’s