- A
Change the record type to A/AAAA alias with an active-active routing policy so both regions always receive equal traffic.
Why wrong: Active-active routing is intended to split traffic across regions regardless of health. It does not provide the required behavior of preferring the secondary only when the primary health check fails.
- B
Switch to Route 53 failover routing: configure the primary record with the primary health check and the secondary record with the secondary failover health check.
Failover routing is designed for disaster recovery-style behavior using health checks. Route 53 returns the primary record when its health check is passing, and it automatically switches resolution to the secondary record when the primary health check fails. This directly matches the requirement that clients should mostly move to the secondary region during a primary regional outage.
- C
Keep latency-based routing but shorten the health check interval to 5 seconds.
Why wrong: Shorter health check intervals may speed detection, but latency-based routing does not implement deterministic primary/secondary selection during outages. Depending on routing behavior and cached DNS responses, clients can still receive answers that favor the primary region.
- D
Use geolocation routing so requests from each country route to the nearest region.
Why wrong: Geolocation routing chooses targets based on user location, not service health. It can continue routing to the unhealthy primary region if it still appears “nearest” for many clients.
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 hosts a public API using two AWS regions behind a single custom domain. Route 53 is configured with latency-based routing and health checks. During a regional outage, application metrics confirm the primary API is unhealthy, but clients still resolve to the primary region for most requests. Which DNS configuration change will most directly ensure automatic failover to the secondary region when the primary fails?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"primary"Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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
Switch to Route 53 failover routing: configure the primary record with the primary health check and the secondary record with the secondary failover health check.
Option B is correct because Route 53 failover routing with health checks explicitly directs traffic to the secondary region when the primary health check fails. This ensures automatic failover at the DNS level, whereas latency-based routing does not guarantee failover even with health checks—it only reduces latency and may still return unhealthy records if no healthier alternative exists.
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.
- ✗
Change the record type to A/AAAA alias with an active-active routing policy so both regions always receive equal traffic.
Why it's wrong here
Active-active routing is intended to split traffic across regions regardless of health. It does not provide the required behavior of preferring the secondary only when the primary health check fails.
- ✓
Switch to Route 53 failover routing: configure the primary record with the primary health check and the secondary record with the secondary failover health check.
Why this is correct
Failover routing is designed for disaster recovery-style behavior using health checks. Route 53 returns the primary record when its health check is passing, and it automatically switches resolution to the secondary record when the primary health check fails. This directly matches the requirement that clients should mostly move to the secondary region during a primary regional outage.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Keep latency-based routing but shorten the health check interval to 5 seconds.
Why it's wrong here
Shorter health check intervals may speed detection, but latency-based routing does not implement deterministic primary/secondary selection during outages. Depending on routing behavior and cached DNS responses, clients can still receive answers that favor the primary region.
- ✗
Use geolocation routing so requests from each country route to the nearest region.
Why it's wrong here
Geolocation routing chooses targets based on user location, not service health. It can continue routing to the unhealthy primary region if it still appears “nearest” for many clients.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume latency-based routing with health checks will automatically fail over, but it only routes to the lowest-latency healthy endpoint—if no healthy endpoint exists, it may still return unhealthy records, whereas failover routing explicitly switches to the secondary record on health check failure.
Detailed technical explanation
How to think about this question
Route 53 failover routing uses DNS-level failover with health checks that evaluate HTTP, HTTPS, or TCP endpoints. When the primary health check fails, Route 53 returns the secondary record's IP with a TTL that can be as low as 60 seconds, enabling rapid failover. In contrast, latency-based routing selects the region with the lowest latency among healthy records, but if no healthy records exist, it may still return unhealthy ones, leading to the observed behavior.
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: Switch to Route 53 failover routing: configure the primary record with the primary health check and the secondary record with the secondary failover health check. — Option B is correct because Route 53 failover routing with health checks explicitly directs traffic to the secondary region when the primary health check fails. This ensures automatic failover at the DNS level, whereas latency-based routing does not guarantee failover even with health checks—it only reduces latency and may still return unhealthy records if no healthier alternative exists.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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