DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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 data engineer is setting up a data pipeline that ingests streaming data from Amazon Kinesis Data Streams into an S3 data lake using Amazon Kinesis Data Firehose. The data contains personally identifiable information (PII). The security team requires that all data be encrypted at rest in S3 using an AWS KMS customer managed key (CMK) that is specific to the application. Additionally, the data must be encrypted in transit between all services. The engineer creates the KMS key and configures Firehose to use server-side encryption with the key for the S3 destination. However, Firehose delivery fails with an error indicating that the KMS key is not accessible. What is the most likely cause?
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
✓
The KMS key policy does not grant the firehose.amazonaws.com service principal the required permissions.
Kinesis Data Firehose needs permission to use the KMS key. The key policy must grant the Firehose service principal (firehose.amazonaws.com) permission to call kms:GenerateDataKey and kms:Decrypt. Without this, Firehose cannot encrypt the data.
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 KMS key policy does not grant the firehose.amazonaws.com service principal the required permissions.
Why this is correct
Firehose must be allowed to use the key via the key policy.
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 Kinesis data stream is not encrypted at rest.
Why it's wrong here
The requirement is for S3 encryption; stream encryption is separate.
✗
The Firehose delivery stream is not in the same region as the KMS key.
Why it's wrong here
Cross-region KMS is allowed but may need additional permissions; however, the most likely cause is missing key policy.
✗
The S3 bucket policy does not grant the Firehose delivery stream access to write objects.
Why it's wrong here
The bucket policy would cause a different error, not a KMS access issue.
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.
Data Security and Governance — This question tests Data Security and Governance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The KMS key policy does not grant the firehose.amazonaws.com service principal the required permissions. — Kinesis Data Firehose needs permission to use the KMS key. The key policy must grant the Firehose service principal (firehose.amazonaws.com) permission to call kms:GenerateDataKey and kms:Decrypt. Without this, Firehose cannot encrypt the data.
What should I do if I get this DEA-C01 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 DEA-C01 NAT questions on configuration and troubleshooting.
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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