- A
Use a failover routing policy with a primary and secondary record.
Failover routing is designed specifically to send traffic to a secondary endpoint when the primary becomes unhealthy.
- B
Create a health check and associate it with the primary endpoint.
Health checks give Route 53 the signal it needs to decide when the primary endpoint should stop receiving answers.
- C
Use weighted routing with a 50/50 traffic split between both Regions.
Why wrong: Weighted routing distributes traffic, but it does not automatically fail over based on endpoint health.
- D
Use latency-based routing so clients always choose the fastest Region.
Why wrong: Latency-based routing optimizes performance, but it is not the same as primary-secondary failover behavior.
- E
Use a geolocation policy without health checks.
Why wrong: Geolocation routes by user location and still requires additional health-aware design for automatic failover.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 SaaS application is deployed in us-east-1 and us-west-2 behind separate ALBs. The business wants DNS to send new clients to the primary Region when it is healthy and automatically fail over to the secondary Region when the primary endpoint is unhealthy. Which two Route 53 settings are required? Select two.
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 failover routing policy with a primary and secondary record.
A failover routing policy is correct because it allows you to designate one record as primary and another as secondary. Route 53 will route traffic to the primary record as long as it is healthy, and automatically fail over to the secondary record when the primary is unhealthy. This directly meets the requirement to send new clients to the primary region when healthy and fail over to the secondary region.
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 failover routing policy with a primary and secondary record.
Why this is correct
Failover routing is designed specifically to send traffic to a secondary endpoint when the primary becomes unhealthy.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Create a health check and associate it with the primary endpoint.
Why this is correct
Health checks give Route 53 the signal it needs to decide when the primary endpoint should stop receiving answers.
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 weighted routing with a 50/50 traffic split between both Regions.
Why it's wrong here
Weighted routing distributes traffic, but it does not automatically fail over based on endpoint health.
When this WOULD be correct
When the requirement is to distribute traffic evenly across two healthy endpoints for load balancing, without automatic failover, such as for A/B testing or gradual rollout.
- ✗
Use latency-based routing so clients always choose the fastest Region.
Why it's wrong here
Latency-based routing optimizes performance, but it is not the same as primary-secondary failover behavior.
When this WOULD be correct
A global application wants to minimize latency for users worldwide and does not require active failover; each user should be routed to the region that provides the fastest response time, with health checks optionally used to exclude unhealthy endpoints.
- ✗
Use a geolocation policy without health checks.
Why it's wrong here
Geolocation routes by user location and still requires additional health-aware design for automatic failover.
When this WOULD be correct
A question requiring traffic to be routed to specific endpoints based on client geographic origin (e.g., 'Route users from Europe to eu-west-1, and users from North America to us-east-1') without needing automatic failover would make geolocation policy correct.
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 a failover routing policy with a primary and secondary record.Correct answer▾
Why this is correct
Failover routing is designed specifically to send traffic to a secondary endpoint when the primary becomes unhealthy.
✗Use weighted routing with a 50/50 traffic split between both Regions.Wrong answer — click to see why▾
Why this is wrong here
Weighted routing with a 50/50 split distributes traffic evenly regardless of health, failing to automatically fail over to the secondary region when the primary endpoint is unhealthy.
★ When this WOULD be the correct answer
When the requirement is to distribute traffic evenly across two healthy endpoints for load balancing, without automatic failover, such as for A/B testing or gradual rollout.
Why candidates choose this
Candidates may think a 50/50 split provides redundancy, but it lacks health-based failover and does not meet the requirement for automatic failover to a secondary region.
✗Use latency-based routing so clients always choose the fastest Region.Wrong answer — click to see why▾
Why this is wrong here
Latency-based routing directs traffic to the region with the lowest latency for each user, not to a primary region with failover to a secondary region when the primary is unhealthy.
★ When this WOULD be the correct answer
A global application wants to minimize latency for users worldwide and does not require active failover; each user should be routed to the region that provides the fastest response time, with health checks optionally used to exclude unhealthy endpoints.
Why candidates choose this
Candidates may confuse latency-based routing with failover because both involve multiple regions, but latency routing optimizes for speed, not for a primary-secondary failover pattern.
✗Use a geolocation policy without health checks.Wrong answer — click to see why▾
Why this is wrong here
Geolocation routing directs traffic based on client location, not health. Without health checks, it cannot automatically fail over when the primary endpoint is unhealthy, which is the core requirement.
★ When this WOULD be the correct answer
A question requiring traffic to be routed to specific endpoints based on client geographic origin (e.g., 'Route users from Europe to eu-west-1, and users from North America to us-east-1') without needing automatic failover would make geolocation policy correct.
Why candidates choose this
Candidates may confuse geolocation with failover, thinking that routing by location inherently provides redundancy, or they overlook the explicit need for health checks to trigger failover.
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 weighted or latency-based routing, thinking any multi-region setup with health checks will automatically fail over, but only failover routing policy provides the explicit primary/secondary failover behavior required.
Detailed technical explanation
How to think about this question
Under the hood, Route 53 failover routing works by associating a health check with the primary record. The health check periodically sends requests (e.g., HTTP, HTTPS, or TCP) to the endpoint; if the health check fails, Route 53 marks the primary record as unhealthy and starts responding to DNS queries with the secondary record's IP address. The DNS TTL (default 60 seconds) controls how quickly clients pick up the change, but cached resolvers may delay failover slightly.
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.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
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 failover routing policy with a primary and secondary record. — A failover routing policy is correct because it allows you to designate one record as primary and another as secondary. Route 53 will route traffic to the primary record as long as it is healthy, and automatically fail over to the secondary record when the primary is unhealthy. This directly meets the requirement to send new clients to the primary region when healthy and fail over to the secondary region.
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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