- A
Create two latency-based alias records for the same name, each with different health checks; Route 53 will automatically shift to the secondary when primary is unhealthy.
Why wrong: Latency-based routing chooses records based on measured latency. While health checks can exclude unhealthy targets, this is not the explicit primary/secondary failover model and does not implement deterministic active-passive failover semantics.
- B
Create a primary alias record and a failover alias record (secondary), configure failover routing policy, and attach health checks to both records.
Route 53 failover routing (primary/secondary) is designed for active-passive regional DR. When the primary health check fails, Route 53 automatically stops returning the primary alias and returns the secondary alias target; attaching health checks ensures the change is driven by the /status endpoint health.
- C
Use geolocation routing with a health check; when the primary is unhealthy, Route 53 will automatically change the region mapping globally.
Why wrong: Geolocation routing directs traffic based on where the user is located. Health checks do not create a “global primary-to-secondary region switch” mapping for a single global name; this is not the intended use of geolocation routing.
- D
Use simple routing with weighted records and a low health check threshold so traffic quickly moves to the secondary region.
Why wrong: Weighted routing distributes traffic by configured weights and is not a failover routing policy. Also, health check thresholds do not replace the need for a primary/secondary failover model that deterministically routes all traffic to the secondary when the primary is unhealthy.
Quick Answer
The answer is the failover routing policy with primary and failover alias records, each attached to a health check. This configuration directly implements active-passive failover because Route 53’s failover policy is designed to route all traffic to the primary record while it is healthy, and automatically shift traffic to the secondary record only when the primary’s health check fails. On the SAA-C03 exam, this scenario tests your understanding that failover routing is the only policy purpose-built for active-passive architectures—common traps include confusing it with latency-based or weighted routing, which serve different purposes. A key memory tip: think of failover as a “circuit breaker” for your primary region—attach health checks to both records, not just the primary, to ensure Route 53 can evaluate the secondary’s readiness before failing over.
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 public API is deployed in two AWS Regions: us-east-1 (primary) and us-west-2 (secondary). The team wants Route 53 to automatically route users to the secondary region if the primary API becomes unhealthy. They will use Route 53 health checks that monitor the API’s /status endpoint over HTTPS. Which Route 53 configuration most directly implements this failover behavior?
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
Create a primary alias record and a failover alias record (secondary), configure failover routing policy, and attach health checks to both records.
B is correct because the failover routing policy in Route 53 is specifically designed for active-passive failover. By creating a primary alias record and a secondary failover alias record, each with an associated health check, Route 53 will automatically route traffic to the secondary region when the health check for the primary fails. This directly implements the required behavior without relying on latency or geographic proximity.
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.
- ✗
Create two latency-based alias records for the same name, each with different health checks; Route 53 will automatically shift to the secondary when primary is unhealthy.
Why it's wrong here
Latency-based routing chooses records based on measured latency. While health checks can exclude unhealthy targets, this is not the explicit primary/secondary failover model and does not implement deterministic active-passive failover semantics.
- ✓
Create a primary alias record and a failover alias record (secondary), configure failover routing policy, and attach health checks to both records.
Why this is correct
Route 53 failover routing (primary/secondary) is designed for active-passive regional DR. When the primary health check fails, Route 53 automatically stops returning the primary alias and returns the secondary alias target; attaching health checks ensures the change is driven by the /status endpoint health.
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 geolocation routing with a health check; when the primary is unhealthy, Route 53 will automatically change the region mapping globally.
Why it's wrong here
Geolocation routing directs traffic based on where the user is located. Health checks do not create a “global primary-to-secondary region switch” mapping for a single global name; this is not the intended use of geolocation routing.
- ✗
Use simple routing with weighted records and a low health check threshold so traffic quickly moves to the secondary region.
Why it's wrong here
Weighted routing distributes traffic by configured weights and is not a failover routing policy. Also, health check thresholds do not replace the need for a primary/secondary failover model that deterministically routes all traffic to the secondary when the primary is unhealthy.
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 geolocation routing, assuming that health checks automatically trigger failover in those policies, but only failover routing provides the explicit active-passive failover behavior described in the question.
Detailed technical explanation
How to think about this question
Failover routing in Route 53 uses an active-passive model where the primary record is returned unless its health check fails, at which point all traffic is directed to the secondary record. Health checks can monitor an endpoint over HTTPS (as in this scenario) and evaluate the response status code (e.g., 2xx or 3xx) to determine health. The failover policy is evaluated per request, and the secondary record must also have a health check to ensure it is healthy before receiving traffic.
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: Create a primary alias record and a failover alias record (secondary), configure failover routing policy, and attach health checks to both records. — B is correct because the failover routing policy in Route 53 is specifically designed for active-passive failover. By creating a primary alias record and a secondary failover alias record, each with an associated health check, Route 53 will automatically route traffic to the secondary region when the health check for the primary fails. This directly implements the required behavior without relying on latency or geographic proximity.
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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Same concept, more angles
2 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A SaaS platform serves an API using two regional deployments: us-east-1 (primary) and us-west-2 (secondary). Each region has its own ALB. The business requires automated DNS-based failover when the primary region becomes unhealthy, and they do not want manual DNS changes during incidents. Which Route 53 configuration is the best match?
medium- A.Create a single Route 53 record using weighted routing across both ALBs with weights adjusted manually during an incident.
- ✓ B.Use Route 53 failover routing with a primary record pointing to the us-east-1 ALB and a secondary record pointing to the us-west-2 ALB, each using health checks.
- C.Use latency-based routing so Route 53 always selects the fastest region; health checks are unnecessary because client latency reflects availability.
- D.Use a single A record with a static IP address that points to a NAT gateway, and update that IP during failure events.
Why B: Route 53 failover routing is designed for active-passive configurations where traffic must automatically shift to a secondary endpoint when the primary fails. By attaching health checks to the primary record (us-east-1 ALB), Route 53 can detect regional unavailability and automatically route traffic to the secondary record (us-west-2 ALB) without manual intervention. This meets the requirement for DNS-based failover without manual DNS changes during incidents.
Variation 2. A SaaS platform serves an API using two regional deployments: us-east-1 (primary) and us-west-2 (secondary). Each region has its own ALB. The business requires automated DNS-based failover when the primary region becomes unhealthy, and they do not want manual DNS changes during incidents. Which Route 53 configuration is the best match?
medium- A.Create a single Route 53 record using weighted routing across both ALBs with weights adjusted manually during an incident.
- ✓ B.Use Route 53 failover routing with a primary record pointing to the us-east-1 ALB and a secondary record pointing to the us-west-2 ALB, each using health checks.
- C.Use latency-based routing so Route 53 always selects the fastest region; health checks are unnecessary because client latency reflects availability.
- D.Use a single A record with a static IP address that points to a NAT gateway, and update that IP during failure events.
Why B: Route 53 failover routing is designed specifically for active-passive failover scenarios where you have a primary and secondary resource. By associating health checks with each record, Route 53 automatically detects when the primary ALB in us-east-1 becomes unhealthy and routes traffic to the secondary ALB in us-west-2 without manual intervention. This meets the requirement for automated DNS-based failover without manual DNS changes.
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Last reviewed: Jun 11, 2026
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