SAA-C03 Design Resilient Architectures Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Backup and Restore.

  Why it's wrong here

  Backup and Restore has a high RTO because it involves re-provisioning infrastructure and restoring data from backups, which takes significant time. It is generally the least expensive but also the slowest recovery method, making it unsuitable for applications that require near-zero downtime or high levels of service availability during a failure.

• ✗

  Pilot Light.

  Why it's wrong here

  The Pilot Light strategy involves keeping a minimal version of the environment running in a secondary region. While it is faster than Backup and Restore, it still requires time to scale up the infrastructure and reconfigure services before traffic can be directed to the secondary region, resulting in a higher RTO.

• ✗

  Warm Standby.

  Why it's wrong here

  Warm Standby maintains a scaled-down version of the full environment in the secondary region. It is faster than Pilot Light but still requires time to scale the capacity to match production levels before it can handle full traffic loads. This delay results in an RTO that is higher than the near-zero requirement.

• ✓

  Multi-Site Active-Active.

  Why this is correct

  The Multi-Site Active-Active approach runs the application in multiple regions simultaneously. Because both regions are already handling production traffic, a failure in one region does not require scaling or recovery time; traffic is simply routed to the remaining active region, resulting in the lowest possible RTO for the application.