Cybersecurity isn’t just about stopping threats as they happen—it’s also about designing systems that are harder to attack in the first place. And that’s the focus of Domain Three: Security Architecture. This domain helps you think like a builder. It’s about how we construct networks, applications, and environments that are secure by design, not just protected after deployment. In this episode, we’re going to introduce Domain Three and walk through the key themes you’ll need to understand—both for the Security Plus exam and for working in the real world.

Security Architecture makes up 18 percent of the Security Plus exam. That’s nearly a fifth of the questions, and every single one of them comes back to a central idea: how do we build technology that’s secure, resilient, and efficient? Whether you’re designing a physical network, a cloud deployment, or an Internet of Things environment, the decisions made at the architecture level determine how well that system can withstand attacks, recover from failures, and adapt to new threats.