How would you answer an interview scenario involving scalability and elasticity in Cloud Architecture?

For an interview scenario involving scalability and elasticity, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. Scalability allows a system to handle increased demand, while elasticity adjusts capacity dynamically as demand changes. In this scenario, traffic grows tenfold during a campaign. Explain how each application tier should respond. For production, measure bottlenecks end to end, design stateless compute, use queues and caching appropriately, set safe autoscaling signals, and load test. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.