Before revision: There are two major variants of intrusion tolerance mechanisms: mechanisms based on redundancy (e.g., as in Byzantine fault tolerance ); mechanisms based on intrusion detection (e.g., with an intrusion detection system) and reaction.
After revision: Distributed computing In distributed computing there are two major variants of intrusion tolerance mechanisms: mechanisms based on redundancy , such as the Byzantine fault tolerance , as well as mechanisms based on intrusion detection as implemented inintrusion intrusion detection system) and reaction.