CompTIA Security+ SY0-701 Practice Question

High availability refers to a system's design that aims to ensure an agreed level of operational performance, typically uptime, for a higher than normal period. This is achieved through redundancy and failover mechanisms that allow a system to remain functional even if some of its components fail. Scalability refers to the ability of a system to handle growth, which is important but doesn't specifically relate to uptime. Redundancy might be part of achieving high availability but on its own does not describe the concept. Power efficiency is related to energy consumption and not directly to maintaining uptime.