Question 110
What is the most relevant clue when choosing an AWS option for this case? A financial transaction system needs capacity in separate fault domains so one isolated data-center outage does not take down the whole service.
Explanation
Correct Answer
Look for fault isolation, recovery behavior, and redundant dependencies. This directly addresses the question rather than a different AWS use case. Reliability benefits from avoiding single points of failure and using independent Availability Zones. Recognize the requirement: Look for fault isolation, recovery behavior, and redundant dependencies. At a high level, distribute critical components across independent zones with appropriate data replication. The intended outcome is: An individual zone disruption does not stop the whole customer transaction path. Keep in mind: Multi-AZ resilience does not automatically deliver cross-Region disaster recovery.
Incorrect Answers
The Well-Architected Framework uses several pillars rather than treating cost as the only criterion. That addresses a different mechanism; this question turns on Look for fault isolation, recovery behavior, and redundant dependencies.
Performance efficiency focuses on selecting and using computing resources effectively as demand evolves. That observation may hold without resolving the relevant issue: Look for fault isolation, recovery behavior, and redundant dependencies.
Operational excellence emphasizes runbooks, observability, safe changes, and learning from failures. It does not verify the requested outcome; here the decisive check concerns Look for fault isolation, recovery behavior, and redundant dependencies.