DEA-C01 Data Store Management Practice Question
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?
⚠ Common exam trap
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.
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
✓
Modify the DB instance to set PubliclyAccessible to false.
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.
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.
- ✗
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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