- A
Use Route 53 failover routing with a PRIMARY and SECONDARY record set for the same name, and attach health checks to the ALBs.
Failover routing is designed for active/passive DNS failover. Route 53 evaluates health checks for the PRIMARY record and automatically serves the SECONDARY record when the PRIMARY is considered unhealthy for the configured evaluation period.
- B
Use latency-based routing so Route 53 automatically spreads traffic to both Regions based on measured latency.
Why wrong: Latency-based routing changes where traffic goes based on latency, not on deterministic health-based failover. It may still send traffic to an unhealthy Region until latency measurements indicate otherwise.
- C
Use weighted routing and configure the secondary ALB to receive 100% traffic when the primary returns HTTP 5xx responses.
Why wrong: Weighted routing does not natively switch weights based on ALB response codes with sustained unhealthy detection. You would still need a health-check-driven failover mechanism rather than relying on weighted distribution rules.
- D
Use geolocation routing and restrict the primary Region record to specific countries only.
Why wrong: Geolocation routing targets traffic by customer location. It does not inherently provide automatic health-based failover between Regions.
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 an internet-facing API in two AWS Regions. Route 53 currently uses simple routing to a primary Application Load Balancer (ALB) DNS name. When the primary Region experiences an outage, customers wait a long time because the DNS entry is not changed automatically.
The team wants automatic failover: if the primary Region ALB health check fails for a sustained period, Route 53 should route users to the secondary Region ALB.
Which Route 53 approach best meets this requirement?
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 Route 53 failover routing with a PRIMARY and SECONDARY record set for the same name, and attach health checks to the ALBs.
Route 53 failover routing is designed specifically for active-passive failover scenarios. By creating PRIMARY and SECONDARY record sets with the same DNS name and attaching health checks to the ALBs, Route 53 will automatically route traffic to the secondary ALB when the primary ALB health check fails for a sustained period. This meets the requirement for automatic failover without manual intervention.
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 Route 53 failover routing with a PRIMARY and SECONDARY record set for the same name, and attach health checks to the ALBs.
Why this is correct
Failover routing is designed for active/passive DNS failover. Route 53 evaluates health checks for the PRIMARY record and automatically serves the SECONDARY record when the PRIMARY is considered unhealthy for the configured evaluation period.
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 latency-based routing so Route 53 automatically spreads traffic to both Regions based on measured latency.
Why it's wrong here
Latency-based routing changes where traffic goes based on latency, not on deterministic health-based failover. It may still send traffic to an unhealthy Region until latency measurements indicate otherwise.
When this WOULD be correct
A company wants to route users to the region with the lowest latency for better performance, and both regions are healthy and active. They do not require failover; they simply want to optimize response times.
- ✗
Use weighted routing and configure the secondary ALB to receive 100% traffic when the primary returns HTTP 5xx responses.
Why it's wrong here
Weighted routing does not natively switch weights based on ALB response codes with sustained unhealthy detection. You would still need a health-check-driven failover mechanism rather than relying on weighted distribution rules.
When this WOULD be correct
When you need to gradually shift traffic from one endpoint to another (e.g., blue/green deployment) or split traffic across multiple endpoints for A/B testing, and you manually adjust weights. Health checks are not required for this scenario.
- ✗
Use geolocation routing and restrict the primary Region record to specific countries only.
Why it's wrong here
Geolocation routing targets traffic by customer location. It does not inherently provide automatic health-based failover between Regions.
When this WOULD be correct
A company needs to restrict access to its API based on the user's country due to licensing or regulatory requirements. For example, users from the EU must be routed to a specific ALB in Frankfurt, while users from the US go to an ALB in Virginia.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use Route 53 failover routing with a PRIMARY and SECONDARY record set for the same name, and attach health checks to the ALBs.Correct answer▾
Why this is correct
Failover routing is designed for active/passive DNS failover. Route 53 evaluates health checks for the PRIMARY record and automatically serves the SECONDARY record when the PRIMARY is considered unhealthy for the configured evaluation period.
✗Use latency-based routing so Route 53 automatically spreads traffic to both Regions based on measured latency.Wrong answer — click to see why▾
Why this is wrong here
Latency-based routing distributes traffic based on lowest latency, not health. It does not provide automatic failover when a region is completely down; users may still be routed to the unhealthy primary if it has lower latency.
★ When this WOULD be the correct answer
A company wants to route users to the region with the lowest latency for better performance, and both regions are healthy and active. They do not require failover; they simply want to optimize response times.
Why candidates choose this
Candidates may think latency routing inherently handles failover because it 'automatically' routes to the best region, but it lacks health check awareness and can still direct traffic to an unhealthy endpoint.
✗Use weighted routing and configure the secondary ALB to receive 100% traffic when the primary returns HTTP 5xx responses.Wrong answer — click to see why▾
Why this is wrong here
Weighted routing distributes traffic based on weights, not health. It cannot automatically shift 100% traffic to the secondary ALB based on HTTP 5xx responses; health checks are not integrated with weighted routing for automatic failover.
★ When this WOULD be the correct answer
When you need to gradually shift traffic from one endpoint to another (e.g., blue/green deployment) or split traffic across multiple endpoints for A/B testing, and you manually adjust weights. Health checks are not required for this scenario.
Why candidates choose this
Candidates may think weighted routing can be used for failover by setting weights to 0 and 100, but they overlook that Route 53 does not automatically adjust weights based on endpoint health.
✗Use geolocation routing and restrict the primary Region record to specific countries only.Wrong answer — click to see why▾
Why this is wrong here
Geolocation routing directs traffic based on the geographic location of the user, not on the health or availability of the endpoint. It cannot automatically failover to a secondary Region when the primary ALB becomes unhealthy.
★ When this WOULD be the correct answer
A company needs to restrict access to its API based on the user's country due to licensing or regulatory requirements. For example, users from the EU must be routed to a specific ALB in Frankfurt, while users from the US go to an ALB in Virginia.
Why candidates choose this
Candidates may confuse geolocation routing with failover routing, thinking that restricting traffic to specific countries can somehow trigger a failover, or they may overestimate Route 53's ability to automatically detect and react to regional outages with geolocation policies.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse failover routing with latency-based or weighted routing, assuming that latency-based routing inherently provides failover, but it does not—it only optimizes for performance, not availability.
Detailed technical explanation
How to think about this question
Route 53 failover routing uses DNS-level health checks that evaluate the health of the ALB endpoint (e.g., HTTP/HTTPS health checks). When the primary health check fails, Route 53 returns the secondary record's IP address in DNS responses, but clients may cache the old DNS response until the TTL expires (commonly 60 seconds). This means failover is not instantaneous; it depends on the TTL configured on the record set. In practice, setting a low TTL (e.g., 10 seconds) can reduce failover time, but clients may still experience delays due to DNS caching.
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 a PRIMARY and SECONDARY record set for the same name, and attach health checks to the ALBs. — Route 53 failover routing is designed specifically for active-passive failover scenarios. By creating PRIMARY and SECONDARY record sets with the same DNS name and attaching health checks to the ALBs, Route 53 will automatically route traffic to the secondary ALB when the primary ALB health check fails for a sustained period. This meets the requirement for automatic failover without manual intervention.
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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