The correct answer is to use CloudFront cache invalidation to remove old objects after updating the origin. This works because CloudFront caches content at edge locations based on TTL settings, and when the origin content changes, the cached copies become stale; invalidation sends a request to purge specific files or paths from all edge caches, forcing CloudFront to fetch the fresh version on the next user request. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of cache management versus alternative approaches like reducing TTL or using versioned filenames—a common trap is thinking that forwarding custom headers alone will bypass caching, but that only creates separate cache entries without clearing the old ones. A reliable memory tip is “invalidate to update”: when content changes, invalidate the path to force a fresh fetch, rather than waiting for TTL expiry.
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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. 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.
A company uses Amazon CloudFront to distribute content to users worldwide. The origin is an Application Load Balancer (ALB) that routes to EC2 instances. The SysOps administrator notices that some users are receiving cached responses even though the content has been updated on the origin. The administrator needs to ensure that users always receive the latest version of the content. What should the administrator do?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "always"
Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use CloudFront cache invalidation to remove the old objects after updating the origin.
Configuring CloudFront to forward the 'Origin' header to the ALB with different values for different requests can create cache behaviors based on the header. However, this does not guarantee no caching. The best approach is to use versioned filenames or cache invalidation. Among the options, using cache invalidation is a direct way to clear cached content. Option A is incorrect because decreasing TTL affects performance. Option B is incorrect because CloudFront does not revalidate every request unless configured with 'no-cache' headers. Option D is incorrect because Lambda@Edge can modify headers but does not automatically invalidate cache.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Configure the ALB to send a Cache-Control: no-cache header.
Why it's wrong here
This tells CloudFront to revalidate with the origin, but it still may serve cached content if the origin doesn't respond with a new ETag.
✗
Set up a Lambda@Edge function to change the origin request path.
Why it's wrong here
This does not clear the cache; it only modifies the request to the origin.
✓
Use CloudFront cache invalidation to remove the old objects after updating the origin.
Why this is correct
Cache invalidation allows you to remove specific files from edge caches, ensuring users get the latest version.
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
Reduce the CloudFront TTL to 0 seconds.
Why it's wrong here
This would force every request to the origin, increasing load and latency, and is not a best practice.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Networking and Content Delivery — This question tests Networking and Content Delivery — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use CloudFront cache invalidation to remove the old objects after updating the origin. — Configuring CloudFront to forward the 'Origin' header to the ALB with different values for different requests can create cache behaviors based on the header. However, this does not guarantee no caching. The best approach is to use versioned filenames or cache invalidation. Among the options, using cache invalidation is a direct way to clear cached content. Option A is incorrect because decreasing TTL affects performance. Option B is incorrect because CloudFront does not revalidate every request unless configured with 'no-cache' headers. Option D is incorrect because Lambda@Edge can modify headers but does not automatically invalidate cache.
What should I do if I get this SOA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Are there clue words in this question I should notice?
Yes — watch for: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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