CISSP Information Systems Security

Answer: B - Botnet refers to a collection of Zombie computers running software-usually installed via drive-by downloads-exploiting Web browser vulnerabilities, worms, Trojan horses, or backdoors under a common command-and-control infrastructure. They can be harmful to your computer.

A botnet is a group of computers running a computer application controlled and manipulated only by the owner or the software source. The botnet may refer to a legitimate network of several computers that share program processing among them. Once the robot software has been successfully installed on a computer, this computer becomes a zombie or a drone, unable to resist the commands of the bot commander. A botnet may be small or large, depending on the complexity and sophistication of the bots used.