This DEA-C01 practice question tests your understanding of data store management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Network Topology
Refer to the exhibit. A data engineer runs the above CLI command and sees the output. The security team requires that the RDS instance not be accessible from the internet. Which change should the engineer make?
Network Topology
A
Change the storage type to io1 for better performance.
Why wrong: Storage type does not affect network accessibility.
B
Modify the DB instance to set PubliclyAccessible to false.
This removes the public IP address.
C
Enable Multi-AZ deployment to improve security.
Why wrong: Multi-AZ does not affect internet accessibility.
D
Update the VPC security group to deny inbound traffic from 0.0.0.0/0.
Why wrong: Security group can block traffic but the instance still has a public IP.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Modify the DB instance to set PubliclyAccessible to false.
Option B is correct because setting the `PubliclyAccessible` attribute to `false` ensures that the RDS instance is not assigned a public IP address and is not reachable from the internet. This directly satisfies the security team's requirement, as the instance will only be accessible from within the VPC. The CLI command shown modifies the DB instance, and this parameter is the standard AWS mechanism to control internet accessibility for RDS.
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.
✗
Change the storage type to io1 for better performance.
Why it's wrong here
Storage type does not affect network accessibility.
✓
Modify the DB instance to set PubliclyAccessible to false.
Why this is correct
This removes the public IP address.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable Multi-AZ deployment to improve security.
Why it's wrong here
Multi-AZ does not affect internet accessibility.
✗
Update the VPC security group to deny inbound traffic from 0.0.0.0/0.
Why it's wrong here
Security group can block traffic but the instance still has a public IP.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The DEA-C01 exam often tests the misconception that modifying a security group to block all inbound traffic is sufficient to make an RDS instance private, but the trap here is that the instance can still have a public IP address and be reachable from the internet if the security group rule is later removed or if the instance is in a public subnet.
Detailed technical explanation
How to think about this question
Under the hood, the `PubliclyAccessible` parameter controls whether the RDS instance receives a public DNS name and an Elastic IP address from Amazon's public IP pool. When set to `false`, the instance is launched in a private subnet without a public IP, and all traffic must go through a NATgateway or VPN. In real-world scenarios, relying solely on security groups can lead to exposure if the instance is accidentally assigned a public IP (e.g., during a restore or snapshot operation), making the `PubliclyAccessible` flag the authoritative control.
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.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Modify the DB instance to set PubliclyAccessible to false. — Option B is correct because setting the `PubliclyAccessible` attribute to `false` ensures that the RDS instance is not assigned a public IP address and is not reachable from the internet. This directly satisfies the security team's requirement, as the instance will only be accessible from within the VPC. The CLI command shown modifies the DB instance, and this parameter is the standard AWS mechanism to control internet accessibility for RDS.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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