This DBS-C01 practice question tests your understanding of database security. 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 company has an Amazon RDS for Oracle DB instance that needs to be encrypted at rest. The instance currently uses Oracle Transparent Data Encryption (TDE) with a key stored in the database. The company wants to use AWS KMS for key management. What is the correct migration path?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.
Option D is correct because to change the encryption key from Oracle TDE to KMS, you must take a snapshot, copy it with encryption (using KMS key), and restore. Option A is wrong because you cannot modify the encryption key in place. Option B is wrong because creating a read replica does not allow changing the encryption key. Option C is wrong because you cannot directly enable KMS on an existing TDE instance.
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.
✓
Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.
Why this is correct
This is the standard method to change encryption keys for an RDS instance.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable KMS encryption directly on the existing DB instance using the AWS CLI.
Why it's wrong here
There is no direct method to enable KMS on an existing instance already using TDE.
✗
Create a read replica with KMS encryption.
Why it's wrong here
Read replicas inherit the encryption configuration of the source instance.
✗
Modify the DB instance and select the KMS key.
Why it's wrong here
Modifying an existing instance does not allow changing the encryption key type.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 DBS-C01 NAT questions on configuration and troubleshooting.
Database Security — This question tests Database Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. — Option D is correct because to change the encryption key from Oracle TDE to KMS, you must take a snapshot, copy it with encryption (using KMS key), and restore. Option A is wrong because you cannot modify the encryption key in place. Option B is wrong because creating a read replica does not allow changing the encryption key. Option C is wrong because you cannot directly enable KMS on an existing TDE instance.
What should I do if I get this DBS-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 DBS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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