- A
Keep latency-based routing, and set the weights so the secondary Region rarely receives traffic unless manual changes are made.
Why wrong: Latency-based and weighted routing choose targets based on client latency and assigned weights. They do not provide a deterministic primary/standby failover behavior that activates solely when health checks fail.
- B
Use a Route 53 failover routing policy: configure two alias records for the ALBs where the primary record is marked PRIMARY, the secondary is marked SECONDARY, and each record has an associated health check.
Route 53 failover routing uses health checks to determine whether to return the PRIMARY or SECONDARY record. When the primary health check fails, Route 53 automatically switches resolution to the secondary ALB.
- C
Use an alias A record that returns both ALBs simultaneously so clients automatically load balance across Regions during outages.
Why wrong: Returning multiple targets does not inherently implement failover semantics. Clients may still receive responses pointing to an unhealthy Region, and it does not guarantee that traffic shifts only after primary health failure.
- D
Use geolocation routing to route users to the primary Region and rely on ALB health checks to shift requests between Regions.
Why wrong: Geolocation routing is based on the end-user’s location, not service health. ALB health checks control target health within an ALB, not Route 53’s region-level routing decisions.
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 an internal API behind an Application Load Balancer (ALB) in two AWS Regions. They want Amazon Route 53 to automatically fail over to the secondary Region when the primary Region’s ALB is unhealthy. Health checks for the primary ALB are already configured, but the DNS record currently uses a latency-based routing policy. Which Route 53 configuration most directly provides automatic failover based on health status?
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
Use a Route 53 failover routing policy: configure two alias records for the ALBs where the primary record is marked PRIMARY, the secondary is marked SECONDARY, and each record has an associated health check.
Option B is correct because Route 53 failover routing policy is specifically designed to automatically route traffic away from an unhealthy resource to a healthy one. By creating two alias records (one PRIMARY with an associated health check for the primary ALB, and one SECONDARY for the secondary ALB), Route 53 will automatically fail over to the secondary record when the primary health check fails. This directly meets the requirement for automatic failover based on health status, unlike latency-based routing which only optimizes for response time.
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.
- ✗
Keep latency-based routing, and set the weights so the secondary Region rarely receives traffic unless manual changes are made.
Why it's wrong here
Latency-based and weighted routing choose targets based on client latency and assigned weights. They do not provide a deterministic primary/standby failover behavior that activates solely when health checks fail.
- ✓
Use a Route 53 failover routing policy: configure two alias records for the ALBs where the primary record is marked PRIMARY, the secondary is marked SECONDARY, and each record has an associated health check.
Why this is correct
Route 53 failover routing uses health checks to determine whether to return the PRIMARY or SECONDARY record. When the primary health check fails, Route 53 automatically switches resolution to the secondary ALB.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use an alias A record that returns both ALBs simultaneously so clients automatically load balance across Regions during outages.
Why it's wrong here
Returning multiple targets does not inherently implement failover semantics. Clients may still receive responses pointing to an unhealthy Region, and it does not guarantee that traffic shifts only after primary health failure.
- ✗
Use geolocation routing to route users to the primary Region and rely on ALB health checks to shift requests between Regions.
Why it's wrong here
Geolocation routing is based on the end-user’s location, not service health. ALB health checks control target health within an ALB, not Route 53’s region-level routing decisions.
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-based routing inherently provides health-based failover, but it only optimizes for latency and does not automatically reroute based on health status.
Detailed technical explanation
How to think about this question
Route 53 failover routing policy works by evaluating the health check associated with each record; if the primary record's health check fails, Route 53 returns the secondary record's value in DNS responses. The health check can monitor the ALB's endpoint (e.g., HTTP 200 response) or use a CloudWatch alarm, and the DNS TTL (default 60 seconds) determines how quickly clients receive the updated routing. In a real-world scenario, if the primary Region's ALB becomes unhealthy due to an AZ failure, the failover routing policy ensures traffic is redirected to the secondary Region within minutes, whereas latency-based routing would continue sending traffic to the unhealthy endpoint until manual intervention.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
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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 a Route 53 failover routing policy: configure two alias records for the ALBs where the primary record is marked PRIMARY, the secondary is marked SECONDARY, and each record has an associated health check. — Option B is correct because Route 53 failover routing policy is specifically designed to automatically route traffic away from an unhealthy resource to a healthy one. By creating two alias records (one PRIMARY with an associated health check for the primary ALB, and one SECONDARY for the secondary ALB), Route 53 will automatically fail over to the secondary record when the primary health check fails. This directly meets the requirement for automatic failover based on health status, unlike latency-based routing which only optimizes for response time.
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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