- A
Use a single Alias A record with simple routing and a short TTL so Route 53 quickly changes the IP address.
Why wrong: Simple routing with an Alias record does not perform health-check-based switching to a different endpoint/record set. TTL affects caching duration, but it does not implement failover logic.
- B
Use Route 53 failover routing with a primary record and a secondary record, each associated with its own health check, so Route 53 answers with the healthy region.
Failover routing is designed for this: Route 53 evaluates health checks and returns the primary record while it is healthy. When the primary health check fails, Route 53 automatically returns the secondary record. Note that clients may still see traffic for a few minutes due to DNS caching, but failover routing is the configuration that enables automatic region switching.
- C
Use weighted routing to send a small percentage of traffic to the secondary region, increasing it manually when the primary fails.
Why wrong: Weighted routing distributes traffic but does not automatically switch based on health. Manual changes introduce delay and operational dependencies.
- D
Use latency routing only, letting Route 53 choose the lowest-latency region at query time, without health checks.
Why wrong: Latency routing optimizes for latency and does not provide deterministic failover semantics based on endpoint health. If the primary is unhealthy but still resolves, clients can keep being directed there.
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.
Your public API is hosted in two regions. You want Route 53 to automatically send traffic to the secondary region when the primary region’s endpoint fails. The primary API health check is returning failure codes, but clients still reach the primary region for several minutes. Which Route 53 configuration most directly addresses this 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
Use Route 53 failover routing with a primary record and a secondary record, each associated with its own health check, so Route 53 answers with the healthy region.
Option B is correct because Route 53 failover routing with health checks on both primary and secondary records ensures that when the primary health check fails, Route 53 stops returning the primary record's IP and instead returns the secondary record's IP. This directly addresses the observed behavior where clients still reach the primary region for several minutes—likely because the primary record's health check was not configured or associated, or a simple routing policy was used without health check integration, causing stale DNS responses to be served until TTL expires.
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 a single Alias A record with simple routing and a short TTL so Route 53 quickly changes the IP address.
Why it's wrong here
Simple routing with an Alias record does not perform health-check-based switching to a different endpoint/record set. TTL affects caching duration, but it does not implement failover logic.
- ✓
Use Route 53 failover routing with a primary record and a secondary record, each associated with its own health check, so Route 53 answers with the healthy region.
Why this is correct
Failover routing is designed for this: Route 53 evaluates health checks and returns the primary record while it is healthy. When the primary health check fails, Route 53 automatically returns the secondary record. Note that clients may still see traffic for a few minutes due to DNS caching, but failover routing is the configuration that enables automatic region switching.
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 weighted routing to send a small percentage of traffic to the secondary region, increasing it manually when the primary fails.
Why it's wrong here
Weighted routing distributes traffic but does not automatically switch based on health. Manual changes introduce delay and operational dependencies.
- ✗
Use latency routing only, letting Route 53 choose the lowest-latency region at query time, without health checks.
Why it's wrong here
Latency routing optimizes for latency and does not provide deterministic failover semantics based on endpoint health. If the primary is unhealthy but still resolves, clients can keep being directed there.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume a short TTL alone (Option A) is sufficient for fast failover, but without health checks, Route 53 has no mechanism to detect endpoint failure and will continue returning the primary record until the TTL expires and the record is manually updated, causing the observed delay.
Detailed technical explanation
How to think about this question
Route 53 failover routing uses active-passive configuration: the primary record is associated with a health check that monitors the endpoint (e.g., via HTTP/S, TCP, or HTTPS). When the health check fails, Route 53 marks the primary record as unhealthy and automatically returns the secondary record's IP in DNS responses. The DNS TTL on the failover records is typically set low (e.g., 60 seconds) to minimize propagation delay, but the failover itself is triggered by health check status changes, not TTL expiry. Under the hood, Route 53 health checkers are distributed globally and evaluate the endpoint every 30 seconds by default; after three consecutive failures, the health check is marked unhealthy, and subsequent DNS queries receive the secondary record.
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.
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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 a primary record and a secondary record, each associated with its own health check, so Route 53 answers with the healthy region. — Option B is correct because Route 53 failover routing with health checks on both primary and secondary records ensures that when the primary health check fails, Route 53 stops returning the primary record's IP and instead returns the secondary record's IP. This directly addresses the observed behavior where clients still reach the primary region for several minutes—likely because the primary record's health check was not configured or associated, or a simple routing policy was used without health check integration, causing stale DNS responses to be served until TTL expires.
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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Last reviewed: Jun 11, 2026
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