
High Availability Architectures (Domain 3)
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Availability is one of the core tenets of cybersecurity, and in mission-critical environments, downtime is simply not an option. In this episode, we focus on high availability (HA) architectures—design strategies that ensure systems remain operational even when components fail. We examine techniques like clustering, load balancing, redundancy, failover mechanisms, and geographic dispersion, all of which contribute to resilience and uptime. We explain the difference between active-active and active-passive configurations, how to plan for single points of failure, and why HA should be part of your threat modeling process—not just your IT checklist. We also highlight the importance of maintaining availability without sacrificing security, as overly permissive failover designs can open unintended pathways for attackers. A high availability design is not just about keeping the lights on—it’s about ensuring continuity under stress, attack, or disaster.