SAP-C03 practice question: Multi-Region failover (ARC, Route 53, Global Accelerator, multi-cluster containers) (1 of 2)
Resilience, Migration, and Business Continuity A free question from our original SAP-C03 practice exam. Try it, then open the answer to see why each option is right or wrong.
A car maker runs its dealer-ordering application in two Regions, with the primary Region serving all traffic. The on-call leads must be able to move traffic to the secondary Region during an incident, but the team does not want automatic failovers triggered by a brief network blip.
The switch must be a single, deliberate action, and the system must refuse a change that would leave no Region serving traffic. The change must take effect within a few minutes.
Which solution meets these requirements?
Choose one answer.
AA. Create Route 53 failover records driven by health checks on the primary Region's endpoints, with a failure threshold of three checks, so that traffic moves automatically whenever the primary's health check fails.
BB. Edit the Route 53 weighted records by hand from the console during an incident, moving the weight from the primary to the secondary Region, with a 60-second time to live.
CC. Change the traffic dials in a Global Accelerator endpoint group by hand, moving the share of traffic from the primary to the secondary Region.
DD. Create an ARC routing control for each Region with a safety rule that refuses any change leaving no Region on, and tie the Route 53 records to routing control health checks that an on-call lead flips.
Show the answer and explanation
Answer: D
A. Wrong: Automatic failover on a health check is what the team ruled out, since a brief blip would move traffic. The option gives the on-call leads no deliberate switch.
B. Wrong: A manual edit is deliberate, but the console change has no safety rule that refuses a switch leaving no Region serving. Mistakes in the edit would go straight to customers.
C. Wrong: The dials can shift traffic deliberately, but the option has no safety rule that blocks a change leaving no Region serving. The requirement calls for that check.
D. Right: Correct. Routing controls are switched deliberately, and safety rules block any change that would leave no Region serving traffic. Route 53 uses the control state in its health checks, and the change propagates within minutes.
Explanation
ARC routing controls give a deliberate switch, and their safety rules refuse any change that leaves no Region serving. Automatic health-check failover, hand-edited weights and manual dial changes each lack either the deliberate control or the safety rule.
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