- A
Use latency-based routing with one routing policy per region, and use CloudWatch alarms to update traffic weights between regions.
Why wrong: Latency-based routing distributes traffic based on DNS latency measurements, not health. Weight changes driven by alarms require additional automation and are not inherently “health-check driven” failover.
- B
Use Route 53 failover routing with two ALIAS records (same DNS name) pointing to the API Gateway regional endpoints: one record is configured as PRIMARY with an associated health check, and the other is configured as SECONDARY.
Failover routing is designed for active-passive regional resiliency. With a PRIMARY record tied to a health check, Route 53 automatically returns DNS answers to the SECONDARY endpoint when the PRIMARY fails health checks.
- C
Use weighted routing across both regions and rely on Route 53 health checks to automatically set the secondary to 100% weight when the primary fails.
Why wrong: Weighted routing does not inherently change weights based on health checks by itself. Changing weights based on health typically requires additional automation (for example, updating the record values).
- D
Use geolocation routing to map some client geographies to the secondary region and the rest to the primary region.
Why wrong: Geolocation routing chooses answers based on where the resolver/client is located, not on whether the primary endpoint is healthy.
Quick Answer
The answer is Route 53 failover routing with two ALIAS records pointing to the API Gateway regional endpoints, one configured as PRIMARY with an associated health check and the other as SECONDARY. This setup is correct because failover routing is explicitly designed for active-passive multi-region architectures: Route 53 directs all traffic to the primary record as long as its health check passes, and only when that health check fails does it automatically route traffic to the secondary record. On the SAA-C03 exam, this scenario tests your understanding that failover routing is the only Route 53 routing policy that supports a true active-passive failover pattern, and a common trap is confusing it with weighted routing or latency-based routing, which distribute traffic differently. Remember the mnemonic “Failover = First, then Fallback” — the PRIMARY record gets all traffic first, and the SECONDARY is the fallback only when the primary is unhealthy.
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.
You host a public API using Amazon API Gateway in two AWS Regions: us-east-1 (primary) and us-west-2 (secondary). You want Route 53 to send client traffic to the secondary region only when the primary API is unhealthy. Which Route 53 setup 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
Use Route 53 failover routing with two ALIAS records (same DNS name) pointing to the API Gateway regional endpoints: one record is configured as PRIMARY with an associated health check, and the other is configured as SECONDARY.
Route 53 failover routing is designed for active-passive setups where traffic is sent to a primary resource unless it is unhealthy, in which case traffic is routed to a secondary resource. By creating two ALIAS records with the same DNS name, one marked PRIMARY with an associated health check and the other marked SECONDARY, Route 53 will automatically fail over to the secondary region when the health check for the primary API Gateway endpoint fails. This directly meets the requirement of sending traffic to the secondary region only when the primary API is 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.
- ✗
Use latency-based routing with one routing policy per region, and use CloudWatch alarms to update traffic weights between regions.
Why it's wrong here
Latency-based routing distributes traffic based on DNS latency measurements, not health. Weight changes driven by alarms require additional automation and are not inherently “health-check driven” failover.
- ✓
Use Route 53 failover routing with two ALIAS records (same DNS name) pointing to the API Gateway regional endpoints: one record is configured as PRIMARY with an associated health check, and the other is configured as SECONDARY.
Why this is correct
Failover routing is designed for active-passive regional resiliency. With a PRIMARY record tied to a health check, Route 53 automatically returns DNS answers to the SECONDARY endpoint when the PRIMARY fails health checks.
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.
- ✗
Use weighted routing across both regions and rely on Route 53 health checks to automatically set the secondary to 100% weight when the primary fails.
Why it's wrong here
Weighted routing does not inherently change weights based on health checks by itself. Changing weights based on health typically requires additional automation (for example, updating the record values).
- ✗
Use geolocation routing to map some client geographies to the secondary region and the rest to the primary region.
Why it's wrong here
Geolocation routing chooses answers based on where the resolver/client is located, not on whether the primary endpoint is healthy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse weighted routing with failover routing, mistakenly believing that Route 53 health checks can automatically adjust weights to achieve active-passive failover, when in fact weighted routing does not support dynamic weight adjustment based on health.
Detailed technical explanation
How to think about this question
Under the hood, Route 53 failover routing uses health checks that can monitor an endpoint (e.g., API Gateway regional endpoint) by sending periodic HTTP/HTTPS requests. When the primary record's health check fails, Route 53 removes that record from DNS responses, and the secondary record (which has no health check or a separate health check) becomes the only record returned for the DNS name. This relies on DNS TTL values—typically 60 seconds or less—so clients may experience a brief delay during failover. In a real-world scenario, you must ensure the API Gateway endpoints are regional (not edge-optimized) and that the health check is configured to validate the API's actual response (e.g., 200 OK) rather than just network reachability.
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.
- →
Design Resilient Architectures — study guide chapter
Learn the concepts, then practise the questions
- →
Design Resilient Architectures practice questions
Targeted practice on this topic area only
- →
All SAA-C03 questions
1,040 questions across all exam domains
- →
SAA-C03 study guide
Full concept coverage aligned to exam objectives
- →
SAA-C03 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related SAA-C03 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Design Secure Architectures practice questions
Practise SAA-C03 questions linked to Design Secure Architectures.
Design Resilient Architectures practice questions
Practise SAA-C03 questions linked to Design Resilient Architectures.
Design High-Performing Architectures practice questions
Practise SAA-C03 questions linked to Design High-Performing Architectures.
Design Cost-Optimized Architectures practice questions
Practise SAA-C03 questions linked to Design Cost-Optimized Architectures.
SAA-C03 VPC practice questions
Practise SAA-C03 questions linked to SAA-C03 VPC.
SAA-C03 S3 lifecycle policy questions
Practise SAA-C03 questions linked to SAA-C03 S3 lifecycle policy questions.
SAA-C03 RDS Multi-AZ questions
Practise SAA-C03 questions linked to SAA-C03 RDS Multi-AZ questions.
SAA-C03 IAM policy practice questions
Practise SAA-C03 questions linked to SAA-C03 IAM policy.
SAA-C03 Route 53 failover questions
Practise SAA-C03 questions linked to SAA-C03 Route 53 failover questions.
SAA-C03 CloudFront practice questions
Practise SAA-C03 questions linked to SAA-C03 CloudFront.
SAA-C03 NAT gateway questions
Practise SAA-C03 questions linked to SAA-C03 NAT gateway questions.
SAA-C03 VPC endpoint questions
Practise SAA-C03 questions linked to SAA-C03 VPC endpoint questions.
Practice this exam
Start a free SAA-C03 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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 two ALIAS records (same DNS name) pointing to the API Gateway regional endpoints: one record is configured as PRIMARY with an associated health check, and the other is configured as SECONDARY. — Route 53 failover routing is designed for active-passive setups where traffic is sent to a primary resource unless it is unhealthy, in which case traffic is routed to a secondary resource. By creating two ALIAS records with the same DNS name, one marked PRIMARY with an associated health check and the other marked SECONDARY, Route 53 will automatically fail over to the secondary region when the health check for the primary API Gateway endpoint fails. This directly meets the requirement of sending traffic to the secondary region only when the primary API is 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 11, 2026
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.