Which of the following is NOT a type of rogue system?

The classification of types of rogue systems in network security refers to unauthorized devices or programs that compromise the integrity or security of a network. The correct answer identifies "Active agent" as not being categorized as a rogue system.

"Active agents," in a general context, often refer to legitimate software components or systems that are part of a network's architecture, actively performing their intended functions. In contrast, rogue systems typically involve unauthorized elements that do not have rightful access to network resources. For instance, "Inactive agent" refers to systems or software that could potentially be harmful but are currently not active, while "Alien agent" signifies unauthorized foreign entities that could pose security threats. The term "rogue" itself directly implies systems that operate outside the control of the network's administrators and could lead to various security vulnerabilities.

Understanding the distinction between an active agent and various types of rogue systems is crucial in identifying security risks and implementing effective monitoring and control mechanisms within a network.