Scenario-Based Questions

Definition

Open-ended, problem-solving interviews where the candidate must analyze a hypothetical production outage or requirement and propose a solution.

Explain Like I'm New

The interviewer creates a nightmare scenario, and you have to explain how to fix it while balancing cost, security, and performance.

Real World Example

Scenario: 'Our company's AWS bill just doubled overnight. What steps do you take to identify the cause and reduce the cost?'

Common Use Cases

•Architect interviews
•Troubleshooting validation

Interview Questions

basic

Scenario: You have a web server running on EC2. Users are complaining they cannot access the site, but the server shows it is running. What is the most likely culprit?

intermediate

Scenario: Your application has highly unpredictable traffic. It sits idle for days, then receives 100,000 hits in 5 minutes. What compute architecture should you choose?

Flash Cards

Question

Web server unreachable?

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Answer

Security Groups (Firewalls) or Network ACLs. The server is fine, but the networking rules are likely blocking inbound HTTP traffic on Port 80/443.

Question

Unpredictable traffic?

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Answer

Serverless Functions (Lambda/Cloud Functions). They scale instantly from 0 to 100,000 concurrent executions, and when the traffic drops to zero, you pay absolutely nothing. Standard VMs with Auto Scaling are often too slow to react to instant 5-minute spikes.