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DBS-C01 Database Security Practice Question

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 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

✓

Take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot.

To change the encryption key from Oracle TDE to AWS KMS, you must take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. This process enables encryption at rest with KMS. Option B is incorrect because you cannot directly enable KMS encryption on an existing TDE instance; this is not supported. Option C is incorrect because creating a read replica does not allow changing the encryption key; read replicas inherit the source instance's encryption. Option D is incorrect because you cannot modify the encryption key in place on an existing instance.

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

    To change the encryption key from Oracle TDE to AWS KMS, you must take a snapshot of the DB instance, copy the snapshot with KMS encryption, and restore from the encrypted snapshot. This process enables encryption at rest with KMS.

  • ✗

    Enable KMS encryption directly on the existing DB instance using the AWS CLI.

    Why it's wrong here

    You cannot directly enable KMS encryption on an existing DB instance; a snapshot and restore is required.

  • ✗

    Create a read replica with KMS encryption.

    Why it's wrong here

    Creating a read replica does not allow changing the encryption key; it only applies the same encryption as the source instance.

  • ✗

    Modify the DB instance and select the KMS key.

    Why it's wrong here

    You cannot modify the encryption key in place on an existing instance.

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JA

Written by Johnson Ajibi, MSc IT Security

Senior Network & Security Engineer · founder of Courseiva

This DBS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DBS-C01 exam.