- A
Enable EBS encryption on the existing volumes by modifying the volume attribute
Why wrong: EBS encryption cannot be enabled on existing volumes without creating a new encrypted volume, which requires downtime.
- B
Migrate the database to Amazon RDS Custom for Oracle with encryption enabled
Why wrong: Migrating to RDS Custom would involve downtime and is not the simplest solution for encrypting an existing database.
- C
Use Oracle Transparent Data Encryption (TDE) with AWS KMS as the key store
Oracle TDE can be enabled online with minimal downtime and can use AWS CloudHSM or KMS as the key store.
- D
Use AWS KMS to encrypt the EBS volumes by creating a new encrypted volume and attaching it
Why wrong: This process requires detaching the old volume and attaching the new one, causing downtime.
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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.
A company is running SAP ERP on AWS with an Oracle database. The database is hosted on an EC2 instance with multiple EBS volumes. The company wants to encrypt the database at rest using AWS KMS. What is the correct procedure to enable encryption for the existing Oracle database without downtime?
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
Use Oracle Transparent Data Encryption (TDE) with AWS KMS as the key store
Enabling EBS encryption on a running instance requires creating an encrypted snapshot, restoring a new encrypted volume, and attaching it; this involves downtime. Oracle TDE can be enabled online with minimal impact. AWS KMS does not provide database-level encryption natively; it is used for EBS encryption. Changing to RDS Custom requires migration.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable EBS encryption on the existing volumes by modifying the volume attribute
Why it's wrong here
EBS encryption cannot be enabled on existing volumes without creating a new encrypted volume, which requires downtime.
- ✗
Migrate the database to Amazon RDS Custom for Oracle with encryption enabled
Why it's wrong here
Migrating to RDS Custom would involve downtime and is not the simplest solution for encrypting an existing database.
- ✓
Use Oracle Transparent Data Encryption (TDE) with AWS KMS as the key store
Why this is correct
Oracle TDE can be enabled online with minimal downtime and can use AWS CloudHSM or KMS as the key store.
Related concept
Standard ACLs match source addresses.
- ✗
Use AWS KMS to encrypt the EBS volumes by creating a new encrypted volume and attaching it
Why it's wrong here
This process requires detaching the old volume and attaching the new one, causing downtime.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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. ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement. 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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use Oracle Transparent Data Encryption (TDE) with AWS KMS as the key store — Enabling EBS encryption on a running instance requires creating an encrypted snapshot, restoring a new encrypted volume, and attaching it; this involves downtime. Oracle TDE can be enabled online with minimal impact. AWS KMS does not provide database-level encryption natively; it is used for EBS encryption. Changing to RDS Custom requires migration.
What should I do if I get this PAS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PAS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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