Explanation
Hint: Identify the requirement first, then choose the approach that addresses the main constraints, trade-offs, failure modes, security, cost, and verification.
Correct answer: Start with RTO/RPO; Choose a regional traffic strategy; Address data consistency; Test failover; Control cost and operational complexity
Key reasoning:
- Start with RTO/RPO
- Choose a regional traffic strategy
- Address data consistency
- Test failover
- Control cost and operational complexity
Why the alternatives are weaker:
- Jumping to a technology before clarifying the problem
- Explaining the solution without the reasoning or trade-offs
- Omitting verification, failure handling, or prevention
What the interviewer is testing
- Requirements and constraints
- Architecture and trade-offs
- Reliability, security, cost, and operations
What a Strong Answer Should Cover
- Start with RTO/RPO
- Choose a regional traffic strategy
- Address data consistency
- Test failover
- Control cost and operational complexity
Common Mistakes
- Jumping to a technology before clarifying the problem
- Explaining the solution without the reasoning or trade-offs
- Omitting verification, failure handling, or prevention
Interviewer Follow-ups
- What exactly do RTO and RPO mean here?
- How does data consistency affect the design?
- How would you rehearse regional failure?
Real-World Sample Answer
A strong real-world response should connect requirements to engineering decisions, explain why the chosen approach fits the constraints, and make failure, security, cost, observability, and verification explicit.
