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Question 714 of 1,786

Data Store Management →easyMultiple ChoiceObjective-mapped

Quick Answer

The answer is a prefix mismatch between the S3 lifecycle rule filter and the prefix used by Kinesis Data Firehose. When Kinesis Data Firehose writes data to S3, it uses a dynamic prefix that typically includes the delivery stream’s timestamp and a date-based folder structure, such as `firehose-stream-name/YYYY/MM/DD/HH/`. If your lifecycle rule applies only to objects under a different prefix—for example, `data/`—then the rule’s filter will not match the Firehose-written objects, and the transition to S3 Glacier Deep Archive will never trigger. This scenario tests your understanding of how S3 lifecycle rules interact with Firehose’s default object key patterns, a common trap on the AWS Certified Data Engineer Associate DEA-C01 exam. Many candidates overlook that the lifecycle rule’s filter must exactly match the prefix Firehose is configured to write. A quick memory tip: always check the Firehose delivery stream’s S3 prefix configuration and ensure your lifecycle rule filter uses that same prefix—think “Firehose prefix first, lifecycle filter second.”

DEA-C01 Data Store Management Practice Question

This DEA-C01 practice question tests your understanding of data store management. 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 startup is building a real-time analytics application using Amazon Kinesis Data Streams and Amazon Kinesis Data Analytics. The application processes clickstream data from a website. The data is also stored in Amazon S3 for historical analysis. The company uses an S3 bucket with a lifecycle policy that transitions objects to Amazon S3 Glacier Deep Archive after 30 days. The data engineering team has configured a Kinesis Data Firehose delivery stream to write data to the S3 bucket. The team notices that the data in S3 is not being transitioned to Glacier Deep Archive after 30 days. The lifecycle policy is correctly configured and has been verified. What is the most likely cause of this issue?

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.

Question 1easymultiple choice

Full question →

A
The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose.
If the prefix filter doesn't match the objects' prefixes, the rule won't apply.
B
The Glacier Deep Archive storage class requires a minimum 90-day storage period, so the lifecycle policy cannot transition objects after 30 days.
Why wrong: Lifecycle policies can transition objects to Glacier Deep Archive at any age, but early deletion fees apply.
C
The S3 bucket is not enabled for S3 Intelligent-Tiering, which is required for lifecycle transitions to Glacier Deep Archive.
Why wrong: Intelligent-Tiering is not a prerequisite for lifecycle rules.
D
The S3 bucket does not have S3 Batch Operations enabled to invoke the lifecycle policy.
Why wrong: Batch Operations are not required for lifecycle policies.

Full breakdown with real-world context →

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

✓

The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose.

Option C is correct because Kinesis Data Firehose writes data with a prefix that includes the date, but it often uses the delivery stream's timestamp rather than the object creation date. The lifecycle rule is based on the object creation date. If the prefix does not match the rule filter, the rule may not apply. Option A is wrong because S3 Batch Operations are not related to lifecycle transitions. Option B is wrong because Glacier Deep Archive does have a minimum 90-day storage charge, but the lifecycle rule can still transition after 30 days (though you'll pay a penalty). Option D is wrong because S3 Intelligent-Tiering is an alternative storage class, not a requirement.

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.

✓
The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose.
Why this is correct
If the prefix filter doesn't match the objects' prefixes, the rule won't apply.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
✗
The Glacier Deep Archive storage class requires a minimum 90-day storage period, so the lifecycle policy cannot transition objects after 30 days.
Why it's wrong here
Lifecycle policies can transition objects to Glacier Deep Archive at any age, but early deletion fees apply.
✗
The S3 bucket is not enabled for S3 Intelligent-Tiering, which is required for lifecycle transitions to Glacier Deep Archive.
Why it's wrong here
Intelligent-Tiering is not a prerequisite for lifecycle rules.
✗
The S3 bucket does not have S3 Batch Operations enabled to invoke the lifecycle policy.
Why it's wrong here
Batch Operations are not required for lifecycle policies.

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 DEA-C01 NAT questions on configuration and troubleshooting.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Store Management — This question tests Data Store Management — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The S3 lifecycle rule is configured with a filter that does not match the prefix used by Kinesis Data Firehose. — Option C is correct because Kinesis Data Firehose writes data with a prefix that includes the date, but it often uses the delivery stream's timestamp rather than the object creation date. The lifecycle rule is based on the object creation date. If the prefix does not match the rule filter, the rule may not apply. Option A is wrong because S3 Batch Operations are not related to lifecycle transitions. Option B is wrong because Glacier Deep Archive does have a minimum 90-day storage charge, but the lifecycle rule can still transition after 30 days (though you'll pay a penalty). Option D is wrong because S3 Intelligent-Tiering is an alternative storage class, not a requirement.

What should I do if I get this DEA-C01 question wrong?

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?

Static NAT maps one inside address to one outside address.

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