You now understand security fundamentals at the level expected in SRE interviews.
What to remember:
- AuthN verifies identity, AuthZ verifies permissions. Use least privilege
- Never store secrets in code. Use Vault or cloud secret managers
- Defense in depth: multiple security layers. Zero trust: verify everything
- Container security: scan images, don't run as root, use network policies
- Know that compliance (SOC2, PCI) affects infrastructure decisions
You've completed Phase . Next phases cover system design, troubleshooting scenarios, and company-specific prep.