SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
Exhibit
Route 53 record sets for app.example.com:
- Record 1: Type A, RoutingPolicy=Simple, AliasTarget=alb-use1.amazonaws.com
- Record 2: Type A, RoutingPolicy=Simple, AliasTarget=alb-usw2.amazonaws.com
Health check status:
hc-primary: FAILED
hc-secondary: HEALTHY
Resolver test:
$ dig +short app.example.com
alb-use1.amazonaws.com
Ops note:
The intent is to send all traffic to us-east-1 normally and fail over to us-west-2 only when the primary is unhealthy.
Based on the exhibit, DNS still sends traffic to the primary Region even though Route 53 health checks show the primary endpoint is unhealthy. What is the best change to make failover work as intended?
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.
Route 53 record sets for app.example.com:
- Record 1: Type A, RoutingPolicy=Simple, AliasTarget=alb-use1.amazonaws.com
- Record 2: Type A, RoutingPolicy=Simple, AliasTarget=alb-usw2.amazonaws.com
Health check status:
hc-primary: FAILED
hc-secondary: HEALTHY
Resolver test:
$ dig +short app.example.com
alb-use1.amazonaws.com
Ops note:
The intent is to send all traffic to us-east-1 normally and fail over to us-west-2 only when the primary is unhealthy.
A
Change both records to weighted routing with a 50/50 split so Route 53 can shift traffic gradually.
Why wrong: Weighted routing is useful for traffic distribution or gradual cutovers, but it does not implement the required primary/secondary failover behavior based on health status.
B
Use a failover routing policy with a primary record and a secondary record, and attach the health check to the primary record.
Failover routing is designed for active-passive DNS behavior. With a primary and secondary record, Route 53 answers with the primary record when it is healthy and returns the secondary record when the primary health check fails. The exhibit shows simple routing, which does not express the failover intent. Switching to failover routing aligns the DNS policy with the stated requirement.
C
Switch to latency-based routing so users are always directed to the lowest-latency Region.
Why wrong: Latency-based routing optimizes for user experience, not for an explicit business requirement to prefer one Region and fail over only when it is unhealthy.
D
Use geolocation routing so clients in one Region are sent to the healthier endpoint.
Why wrong: Geolocation routing uses the requester’s location, not the health of the target endpoint, so it does not provide the requested health-based failover model.
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 record and a secondary record, and attach the health check to the primary record.
Option B is correct because a failover routing policy with a health check attached to the primary record is the only configuration that allows Route 53 to automatically stop sending traffic to an unhealthy primary endpoint and redirect it to the secondary endpoint. Without the health check attached to the primary record, Route 53 has no mechanism to detect the failure and will continue routing traffic to the primary Region, even if the health check status shows 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.
✗
Change both records to weighted routing with a 50/50 split so Route 53 can shift traffic gradually.
Why it's wrong here
Weighted routing is useful for traffic distribution or gradual cutovers, but it does not implement the required primary/secondary failover behavior based on health status.
✓
Use a failover routing policy with a primary record and a secondary record, and attach the health check to the primary record.
Why this is correct
Failover routing is designed for active-passive DNS behavior. With a primary and secondary record, Route 53 answers with the primary record when it is healthy and returns the secondary record when the primary health check fails. The exhibit shows simple routing, which does not express the failover intent. Switching to failover routing aligns the DNS policy with 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.
✗
Switch to latency-based routing so users are always directed to the lowest-latency Region.
Why it's wrong here
Latency-based routing optimizes for user experience, not for an explicit business requirement to prefer one Region and fail over only when it is unhealthy.
✗
Use geolocation routing so clients in one Region are sent to the healthier endpoint.
Why it's wrong here
Geolocation routing uses the requester’s location, not the health of the target endpoint, so it does not provide the requested health-based failover model.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Route 53 automatically uses health check status to influence routing regardless of the routing policy, but in reality, health checks only affect routing when explicitly attached to a record in a failover or weighted routing policy.
Detailed technical explanation
How to think about this question
Route 53 failover routing works by associating a health check with the primary record; when the health check fails, Route 53 marks the primary as unhealthy and returns the secondary record's value in DNS responses. The health check is performed every 30 seconds by default (configurable), and Route 53 uses a DNS TTL (typically 60 seconds) to control caching; after the TTL expires, new DNS queries will receive the secondary record's IP. In a real-world scenario, if the health check is not attached to the primary record, Route 53 will continue to serve the primary record's IP even if the endpoint is down, causing application downtime until manual intervention occurs.
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.
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 record and a secondary record, and attach the health check to the primary record. — Option B is correct because a failover routing policy with a health check attached to the primary record is the only configuration that allows Route 53 to automatically stop sending traffic to an unhealthy primary endpoint and redirect it to the secondary endpoint. Without the health check attached to the primary record, Route 53 has no mechanism to detect the failure and will continue routing traffic to the primary Region, even if the health check status shows 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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