- A
Use a single Route 53 A record that points only to Region A’s ALB and manually update it after failures.
Why wrong: A single-record setup does not provide automatic failover and still requires manual changes during outages.
- B
Use Route 53 latency-based routing with separate records for each region.
Why wrong: Latency-based routing optimizes user proximity, but it does not automatically fail over based on health checks.
- C
Use Route 53 failover routing with health checks for each region’s endpoint.
Failover routing works with health checks to move traffic from a primary endpoint to a secondary endpoint when the primary becomes unhealthy.
- D
Use weighted routing and set the Region B weight to 0 to ensure it is only used when needed.
Why wrong: Weighted routing does not react to health status. Weight changes are not automatic failover responses.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company runs the same public API in two regions (Region A and Region B), each fronted by an ALB. They want Route 53 to automatically route clients to the Region B API when Region A becomes unhealthy, with minimal configuration effort. Which Route 53 approach should they use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use Route 53 failover routing with health checks for each region’s endpoint.
Route 53 failover routing with health checks is the correct choice because it automatically directs traffic to the secondary (Region B) endpoint when the primary (Region A) endpoint fails a health check. This provides automated DNS failover with minimal configuration effort, as Route 53 monitors the health of each ALB endpoint and updates DNS responses accordingly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a single Route 53 A record that points only to Region A’s ALB and manually update it after failures.
Why it's wrong here
A single-record setup does not provide automatic failover and still requires manual changes during outages.
- ✗
Use Route 53 latency-based routing with separate records for each region.
Why it's wrong here
Latency-based routing optimizes user proximity, but it does not automatically fail over based on health checks.
- ✓
Use Route 53 failover routing with health checks for each region’s endpoint.
Why this is correct
Failover routing works with health checks to move traffic from a primary endpoint to a secondary endpoint when the primary becomes unhealthy.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use weighted routing and set the Region B weight to 0 to ensure it is only used when needed.
Why it's wrong here
Weighted routing does not react to health status. Weight changes are not automatic failover responses.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse latency-based routing with failover routing, assuming latency routing will automatically redirect traffic away from an unhealthy region, but latency routing has no health awareness and will continue sending traffic to a down endpoint if it has the lowest latency.
Detailed technical explanation
How to think about this question
Failover routing in Route 53 works by associating a primary and secondary record set with a health check. When the health check for the primary endpoint fails (e.g., ALB returns 4xx/5xx or becomes unreachable), Route 53 automatically returns the secondary record's IP in DNS responses. Health checks can be configured to monitor the ALB's endpoint via HTTP/HTTPS with configurable thresholds (e.g., 3 consecutive failures), and Route 53 uses DNS TTLs (typically 60 seconds) to propagate the failover quickly.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use Route 53 failover routing with health checks for each region’s endpoint. — Route 53 failover routing with health checks is the correct choice because it automatically directs traffic to the secondary (Region B) endpoint when the primary (Region A) endpoint fails a health check. This provides automated DNS failover with minimal configuration effort, as Route 53 monitors the health of each ALB endpoint and updates DNS responses accordingly.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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