- A
Latency-based routing with health checks for both Regions.
Why wrong: Latency-based routing chooses the Region primarily based on measured latency. Health checks can remove an endpoint from routing if unhealthy, but it does not guarantee that all traffic switches to a specific secondary Region as a deliberate primary/backup failover policy.
- B
Failover routing with a primary record associated with a health check, and a secondary (failover) record associated with its own health check settings.
Route 53 failover routing is explicitly designed for primary/secondary behavior. When the primary record’s health check fails, Route 53 automatically routes to the secondary (failover) record, matching the stated requirement.
- C
Weighted routing to distribute traffic evenly across both Regions.
Why wrong: Weighted routing sends a configured percentage of traffic to each Region under normal conditions. Even if one endpoint becomes unhealthy, weighted routing by itself does not implement a strict “switch all traffic to the secondary when primary fails” pattern without additional failover-specific configuration.
- D
Geolocation routing based on the client’s country to choose a Region.
Why wrong: Geolocation routing selects endpoints based on where the user is located, not based on the health of the primary Region’s endpoint. It does not provide health-based regional failover.
Quick Answer
The answer is failover routing with a primary record associated with a health check and a secondary failover record with its own health check settings. This configuration is correct because Route 53 failover routing is purpose-built for active-passive multi-region architecture, where traffic flows to the primary region until a health check detects failure, at which point Route 53 automatically reroutes traffic to the secondary region. On the SAA-C03 exam, this scenario tests your understanding of how health checks drive failover behavior—a common trap is confusing failover routing with weighted or latency routing, which do not support automatic failover based on endpoint health. Remember that the primary record must have a health check; without it, Route 53 cannot detect unhealthiness and will not fail over. A useful memory tip is "primary plus probe equals failover"—the primary record always needs a health check probe to trigger the switch to the secondary.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Your company hosts an internal API in two AWS Regions. You want Amazon Route 53 to automatically send traffic to the secondary Region if the primary Region’s endpoint becomes unhealthy. Which Route 53 configuration 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:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Failover routing with a primary record associated with a health check, and a secondary (failover) record associated with its own health check settings.
Failover routing in Route 53 is specifically designed for active-passive configurations where traffic is directed to a primary resource unless a health check indicates it is unhealthy, at which point traffic is automatically routed to the secondary (failover) record. By associating a health check with the primary record, Route 53 can monitor the endpoint's health and perform the failover seamlessly. This directly meets the requirement to send traffic to the secondary Region when the primary endpoint becomes unhealthy.
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.
- ✗
Latency-based routing with health checks for both Regions.
Why it's wrong here
Latency-based routing chooses the Region primarily based on measured latency. Health checks can remove an endpoint from routing if unhealthy, but it does not guarantee that all traffic switches to a specific secondary Region as a deliberate primary/backup failover policy.
- ✓
Failover routing with a primary record associated with a health check, and a secondary (failover) record associated with its own health check settings.
Why this is correct
Route 53 failover routing is explicitly designed for primary/secondary behavior. When the primary record’s health check fails, Route 53 automatically routes to the secondary (failover) record, matching the stated requirement.
Clue confirmation
The clue words "best", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Weighted routing to distribute traffic evenly across both Regions.
Why it's wrong here
Weighted routing sends a configured percentage of traffic to each Region under normal conditions. Even if one endpoint becomes unhealthy, weighted routing by itself does not implement a strict “switch all traffic to the secondary when primary fails” pattern without additional failover-specific configuration.
- ✗
Geolocation routing based on the client’s country to choose a Region.
Why it's wrong here
Geolocation routing selects endpoints based on where the user is located, not based on the health of the primary Region’s endpoint. It does not provide health-based regional failover.
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 routing, assuming that latency-based routing with health checks will automatically redirect traffic to the next best Region when one is unhealthy, but in reality, latency-based routing only selects the lowest-latency healthy endpoint and does not enforce a strict primary-secondary failover order.
Detailed technical explanation
How to think about this question
Failover routing works by creating two alias records (primary and secondary) with the same name, where the primary record is associated with a health check that monitors the endpoint (e.g., via HTTP/HTTPS or TCP). Route 53 uses a 30-second health check interval by default, and after three consecutive failures (configurable), it marks the primary as unhealthy and begins responding to DNS queries with the secondary record's IP. A subtle behavior is that the secondary record can also have its own health check, but if it is unhealthy, Route 53 will return the primary record even if it is unhealthy, so in production you should ensure the secondary is healthy or omit its health check.
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.
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: Failover routing with a primary record associated with a health check, and a secondary (failover) record associated with its own health check settings. — Failover routing in Route 53 is specifically designed for active-passive configurations where traffic is directed to a primary resource unless a health check indicates it is unhealthy, at which point traffic is automatically routed to the secondary (failover) record. By associating a health check with the primary record, Route 53 can monitor the endpoint's health and perform the failover seamlessly. This directly meets the requirement to send traffic to the secondary Region when the primary endpoint becomes unhealthy.
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: "best", "primary". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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