This question-specific review guide is tied to the answer reasoning for a PracticeTestVault item. Use it after you answer the question so the review stays focused on what the prompt actually tested.
What this question is testing
Objective: Design highly available architectures
Prompt focus: A company runs a stateless web application on EC2. Which design provides the highest availability?
Why the correct answer works
An Auto Scaling group across multiple Availability Zones behind a load balancer
An Auto Scaling group across multiple zones behind a load balancer eliminates single points of failure.
Why the tempting wrong answer fails
Incorrect. Snapshots aid recovery but a single instance remains a single point of failure.
Plain-language takeaway
Use the rationale to connect the prompt clue, the correct choice, and the tested objective before retaking a similar item.
Simple analogy
Think of design highly available architectures like following a short checklist: identify the clue, confirm the rule, and then make the move that fits this exact scenario.
How to review it before a retake
- Underline the command word and name what the question is asking before rereading the choices.
- Compare the correct answer against the closest distractor and write the exact detail that separates them.
- Retest this objective with a fresh question without looking at the rationale first.