The answer is to optimize the cache key to include only relevant headers, as this directly improves the CloudFront cache hit ratio by preventing unnecessary cache fragmentation. When CloudFront includes irrelevant or varying headers in the cache key, it treats identical objects as distinct, forcing separate requests to the origin and reducing cache efficiency. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of how cache key design impacts performance, often paired with Origin Shield as a secondary caching layer that consolidates requests from multiple edge locations to further boost hit ratios. A common trap is assuming that adding more headers increases accuracy, when in fact it decreases cache hits; instead, only include headers that the origin actually uses to serve different content. Memory tip: "Keep your key lean, and your cache will be keen."
DOP-C02 Monitoring and Logging Practice Question
This DOP-C02 practice question tests your understanding of monitoring and logging. 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.
A DevOps team is troubleshooting a slow website that uses Amazon CloudFront with an Application Load Balancer as the origin. The team notices that cache hit ratio is low. Which THREE actions are most likely to improve the cache hit ratio?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable CloudFront Origin Shield to reduce load on the origin and increase cache effectiveness.
Option B is correct because CloudFront Origin Shield acts as an additional caching layer that consolidates requests from multiple edge locations, reducing the load on the origin and increasing the likelihood of cache hits by serving cached content from the Origin Shield regional cache. This improves cache effectiveness, especially for origins with high latency or limited capacity.
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.
✗
Configure CloudFront to forward all cookies to the origin.
Why it's wrong here
Forwarding all cookies makes the cache key unique per user, reducing cache hits.
✓
Enable CloudFront Origin Shield to reduce load on the origin and increase cache effectiveness.
Why this is correct
Origin Shield acts as a centralized cache layer, improving hit ratio.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Decrease the default TTL for objects.
Why it's wrong here
A shorter TTL forces objects to be refreshed more often, reducing cache hits.
✓
Increase the minimum TTL for the CloudFront distribution.
Why this is correct
A longer TTL means objects stay in cache longer, increasing hit ratio.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Optimize the cache key to include only relevant headers.
Why this is correct
Reducing cache key variations increases the likelihood of cache hits.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse decreasing TTL with improving cache hit ratio, but in reality, shorter TTLs cause more frequent cache expirations and origin fetches, reducing cache effectiveness.
Detailed technical explanation
How to think about this question
CloudFront Origin Shield is a regional caching layer that sits between edge locations and the origin, aggregating requests for the same object from multiple edges into a single origin request. This reduces origin load and improves cache hit ratio by serving cached objects from the Origin Shield cache, which has a larger cache pool than individual edge locations. The cache key optimization (Option E) ensures that only headers that affect the response (e.g., Accept-Encoding) are included, preventing unnecessary cache fragmentation from irrelevant headers like User-Agent.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Monitoring and Logging — This question tests Monitoring and Logging — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable CloudFront Origin Shield to reduce load on the origin and increase cache effectiveness. — Option B is correct because CloudFront Origin Shield acts as an additional caching layer that consolidates requests from multiple edge locations, reducing the load on the origin and increasing the likelihood of cache hits by serving cached content from the Origin Shield regional cache. This improves cache effectiveness, especially for origins with high latency or limited capacity.
What should I do if I get this DOP-C02 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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