- A
Use simple routing with one record that contains both regions as weighted targets.
Why wrong: Simple routing returns a single set of resource record values and does not implement health-check-driven failover logic. There is no automatic switch based on endpoint health.
- B
Use weighted routing and set the secondary Region weight to 0 until needed.
Why wrong: Weighted routing distributes traffic based on the configured weights. Changing weights is typically a manual process, and routing is not automatically switched solely because a health check marks the primary as unhealthy.
- C
Use Route 53 failover routing with health checks that mark the primary as unhealthy and fail over to the secondary.
Failover routing is designed for active/passive disaster recovery. You configure a primary record and a secondary record, each associated with health checks. When the primary fails its health checks, Route 53 automatically resolves the name to the secondary target.
- D
Use latency-based routing so requests go to the region with the lowest latency, regardless of health.
Why wrong: Latency-based routing optimizes toward the lowest observed latency. Even if an endpoint is unhealthy, latency-based decisions are not a health-check failover mechanism by default.
Quick Answer
The answer is Route 53 failover routing with health checks. This configuration is correct because it implements an active-passive multi-region architecture where all traffic is directed to the primary Region until a health check detects an endpoint failure, at which point Route 53 automatically shifts all traffic to the secondary Region. On the SAA-C03 exam, this scenario tests your understanding of how failover routing differs from weighted, latency, or geolocation policies—the common trap is choosing weighted routing with a 100/0 split, which lacks automatic health-based failover. Remember the key distinction: failover routing is the only policy that inherently pairs with health checks to enable a true active-passive failover pattern. A useful memory tip is "Failover for fail-safe"—when you need automatic, health-check-driven traffic redirection between a primary and secondary resource, failover routing is your only choice.
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.
An organization hosts the same public API in two AWS Regions. Normal traffic should go to the primary Region. If the primary endpoint becomes unhealthy, Route 53 should automatically route users to the secondary Region. What is the best Route 53 configuration approach?
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 health checks that mark the primary as unhealthy and fail over to the secondary.
Route 53 failover routing is designed for active-passive configurations where traffic is directed to a primary resource unless a health check marks it as unhealthy, at which point all traffic automatically shifts to the secondary resource. This directly matches the requirement of routing normal traffic to the primary Region and failing over to the secondary Region only 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.
- ✗
Use simple routing with one record that contains both regions as weighted targets.
Why it's wrong here
Simple routing returns a single set of resource record values and does not implement health-check-driven failover logic. There is no automatic switch based on endpoint health.
- ✗
Use weighted routing and set the secondary Region weight to 0 until needed.
Why it's wrong here
Weighted routing distributes traffic based on the configured weights. Changing weights is typically a manual process, and routing is not automatically switched solely because a health check marks the primary as unhealthy.
- ✓
Use Route 53 failover routing with health checks that mark the primary as unhealthy and fail over to the secondary.
Why this is correct
Failover routing is designed for active/passive disaster recovery. You configure a primary record and a secondary record, each associated with health checks. When the primary fails its health checks, Route 53 automatically resolves the name to the secondary target.
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 latency-based routing so requests go to the region with the lowest latency, regardless of health.
Why it's wrong here
Latency-based routing optimizes toward the lowest observed latency. Even if an endpoint is unhealthy, latency-based decisions are not a health-check failover mechanism by default.
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 thinking that setting a weight of 0 on the secondary is a valid way to keep it inactive until needed, but Route 53 does not automatically adjust weights based on health checks.
Detailed technical explanation
How to think about this question
Route 53 failover routing relies on health checks that can monitor an endpoint via HTTP, HTTPS, or TCP, and can also be associated with CloudWatch alarms for more complex health signals. When the primary record's health check fails, Route 53 propagates the DNS change within its TTL (default 60 seconds), but clients may cache the old DNS response until the TTL expires, so a low TTL (e.g., 10 seconds) is recommended for faster failover. In a real-world scenario, you would also configure the secondary record with its own health check to ensure it is healthy before Route 53 directs traffic to it.
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.
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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 Route 53 failover routing with health checks that mark the primary as unhealthy and fail over to the secondary. — Route 53 failover routing is designed for active-passive configurations where traffic is directed to a primary resource unless a health check marks it as unhealthy, at which point all traffic automatically shifts to the secondary resource. This directly matches the requirement of routing normal traffic to the primary Region and failing over to the secondary Region only 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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