- A
CloudFront caching with appropriate TTLs
CloudFront can serve cached content from edge locations when the origin is temporarily unavailable.
- B
AWS Backup Vault Lock
Why wrong: Backup Vault Lock protects backups, not CloudFront delivery.
- C
IAM Access Analyzer
Why wrong: Access Analyzer reviews permissions and does not serve cached content.
- D
S3 Select
Why wrong: S3 Select retrieves subsets of object data and does not increase origin outage tolerance.
Question 128 of 1,040
CloudFront Caching for S3 Origin Outage
This SAA-C03 practice question tests your understanding of design resilient architectures. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: cloudFront TTL Settings. 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 inventory service exposes a static website from S3 and CloudFront. Users should still receive cached pages if the S3 origin has a short outage. Which feature helps most? The team wants the control to be enforceable during normal operations.
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
✓
CloudFront caching with appropriate TTLs
CloudFront caching with appropriate TTLs allows the distribution to serve stale or cached content from edge locations even when the S3 origin is temporarily unavailable. By setting a minimum TTL (e.g., 0 seconds) and a default/max TTL (e.g., 86400 seconds), CloudFront can continue to respond to user requests with previously cached objects during an origin outage, ensuring high availability. This feature is enforceable during normal operations because the TTL settings are configured in the CloudFront distribution behavior and are always active, not just during failures.
Key principle: CloudFront TTL Settings
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
CloudFront caching with appropriate TTLs
Why this is correct
CloudFront can serve cached content from edge locations when the origin is temporarily unavailable.
Related concept
CloudFront TTL Settings
- ✗
AWS Backup Vault Lock
Why it's wrong here
Backup Vault Lock protects backups, not CloudFront delivery.
- ✗
IAM Access Analyzer
Why it's wrong here
Access Analyzer reviews permissions and does not serve cached content.
- ✗
S3 Select
Why it's wrong here
S3 Select retrieves subsets of object data and does not increase origin outage tolerance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse CloudFront's caching with origin failover or think that features like AWS Backup Vault Lock or IAM Access Analyzer can somehow enforce availability, when in fact only proper TTL configuration ensures cached content is served during an outage.
Detailed technical explanation
How to think about this question
CloudFront's origin failover capability can be combined with custom error responses to serve stale cached objects when the origin returns a 5xx error, but the core mechanism relies on TTL-based caching. Under the hood, CloudFront uses a cache hierarchy (edge locations and regional edge caches) and respects the Cache-Control and Expires headers from the origin, but if those are absent, the configured minimum/default/max TTLs dictate how long objects are retained. In a real-world scenario, setting a minimum TTL of 0 and a default TTL of 86400 seconds ensures that even if the origin goes down for a few minutes, users still see the last successfully cached version of the page.
KKey Concepts to Remember
- CloudFront TTL Settings
- Stale Content Serving
- Enforceable During Normal Operations
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
CloudFront TTL Settings
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review cloudFront TTL Settings, then practise related SAA-C03 questions on the same topic to reinforce the concept.
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Design Resilient Architectures — study guide chapter
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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 — CloudFront TTL Settings.
What is the correct answer to this question?
The correct answer is: CloudFront caching with appropriate TTLs — CloudFront caching with appropriate TTLs allows the distribution to serve stale or cached content from edge locations even when the S3 origin is temporarily unavailable. By setting a minimum TTL (e.g., 0 seconds) and a default/max TTL (e.g., 86400 seconds), CloudFront can continue to respond to user requests with previously cached objects during an origin outage, ensuring high availability. This feature is enforceable during normal operations because the TTL settings are configured in the CloudFront distribution behavior and are always active, not just during failures.
What should I do if I get this SAA-C03 question wrong?
Review cloudFront TTL Settings, then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
CloudFront TTL Settings
About these practice questions
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Same concept, more angles
5 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 content publishing system exposes a static website from S3 and CloudFront. Users should still receive cached pages if the S3 origin has a short outage. Which feature helps most? The design must avoid adding custom operational scripts.
easy- A.IAM Access Analyzer
- B.AWS Backup Vault Lock
- ✓ C.CloudFront caching with appropriate TTLs
- D.S3 Select
Why C: CloudFront caches responses from the S3 origin based on configured TTLs (Cache-Control or Expires headers). If the S3 origin experiences a short outage, CloudFront can still serve cached content to users as long as the TTL has not expired, ensuring availability without custom scripts. This is the most direct and resilient feature for this use case.
Variation 2. A content publishing system exposes a static website from S3 and CloudFront. Users should still receive cached pages if the S3 origin has a short outage. Which feature helps most?
easy- A.IAM Access Analyzer
- B.AWS Backup Vault Lock
- ✓ C.CloudFront caching with appropriate TTLs
- D.S3 Select
Why C: CloudFront caches responses from the S3 origin based on configured TTLs (Cache-Control or Expires headers). If the S3 origin experiences a short outage, CloudFront can still serve cached content to users until the TTL expires, maintaining availability. This is the most direct way to ensure users receive pages during transient origin failures.
Variation 3. A inventory service exposes a static website from S3 and CloudFront. Users should still receive cached pages if the S3 origin has a short outage. Which feature helps most?
easy- ✓ A.CloudFront caching with appropriate TTLs
- B.AWS Backup Vault Lock
- C.IAM Access Analyzer
- D.S3 Select
Why A: CloudFront caches responses from the S3 origin based on configured TTLs (Cache-Control or Expires headers). If the S3 origin experiences a short outage, CloudFront can still serve cached pages to users from its edge locations, maintaining availability. This is the most direct way to ensure users receive content during origin failures.
Variation 4. A inventory service exposes a static website from S3 and CloudFront. Users should still receive cached pages if the S3 origin has a short outage. Which feature helps most? The design must avoid adding custom operational scripts.
easy- ✓ A.CloudFront caching with appropriate TTLs
- B.AWS Backup Vault Lock
- C.IAM Access Analyzer
- D.S3 Select
Why A: CloudFront caches responses at edge locations based on configured TTLs (Cache-Control or Expires headers). If the S3 origin becomes temporarily unavailable, CloudFront can still serve stale or cached content to users, maintaining availability without any custom scripts or failover logic. This directly addresses the requirement to serve cached pages during short S3 outages.
Variation 5. A inventory service exposes a static website from S3 and CloudFront. Users should still receive cached pages if the S3 origin has a short outage. Which feature helps most? The architecture review board prefers a managed AWS-native control.
easy- ✓ A.CloudFront caching with appropriate TTLs
- B.AWS Backup Vault Lock
- C.IAM Access Analyzer
- D.S3 Select
Why A: CloudFront caching with appropriate TTLs allows cached responses to be served to users even when the S3 origin is temporarily unavailable. By setting a minimum TTL (e.g., 0 seconds for fresh content, but a higher default or maximum TTL for stale content), CloudFront can continue delivering previously cached pages from edge locations during an S3 outage, ensuring high availability and resilience. This is a managed AWS-native feature that aligns with the architecture review board's preference.
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Last reviewed: Jun 11, 2026
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