- 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.
Quick Answer
The correct answer is to use Oracle Transparent Data Encryption (TDE) with AWS KMS as the key store, because this approach encrypts the database at rest at the file level within the database engine itself, avoiding any need to modify the underlying EBS volumes. Unlike EBS encryption, which requires downtime to create encrypted snapshots and reattach volumes, Oracle TDE can be enabled online with minimal performance impact, making it the only viable method to encrypt an SAP Oracle database at rest without downtime. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this question tests your understanding of the distinction between infrastructure-level encryption (EBS) and database-level encryption (TDE), and it often appears as a trap where candidates mistakenly choose EBS encryption or RDS Custom migration. A common memory tip is: “TDE is the key to zero downtime—EBS encryption stops the clock.”
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: 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.
- ✗
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
Static NAT maps one inside address to one outside address.
- ✗
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: 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 PAS-C01 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this PAS-C01 question test?
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
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 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 PAS-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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Last reviewed: Jun 20, 2026
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