- A
Launch the DAX cluster in a private subnet with a VPC endpoint.
Why wrong: Launching a DAX cluster in a private subnet with a VPC endpoint does not encrypt traffic; it only provides private connectivity. Encryption in transit must be explicitly enabled on the DAX cluster.
- B
Enable encryption in transit when creating the DAX cluster.
DAX supports TLS encryption in transit when enabled at cluster creation.
- C
Use AWS Certificate Manager to issue a certificate for the DAX cluster.
Why wrong: DAX does not use ACM; it has its own certificate management.
- D
Use client-side encryption to encrypt data before sending it to DAX.
Why wrong: Client-side encryption encrypts data before sending it to DAX, but this does not ensure that all traffic between the application and DAX is encrypted by DAX. To ensure all traffic is encrypted, enable encryption in transit on the DAX cluster.
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. 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 using Amazon DynamoDB Accelerator (DAX) for caching. The security team is concerned about data in transit between the application and DAX. What should the team do to ensure that all traffic to DAX is encrypted?
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
Enable encryption in transit when creating the DAX cluster.
Option B is correct. DAX supports encryption in transit, which must be enabled when creating the cluster. Option A is incorrect because launching in a private subnet with a VPC endpoint does not encrypt traffic; it only provides private connectivity. Option C is incorrect because DAX manages its own encryption certificates and does not use AWS Certificate Manager. Option D is incorrect because client-side encryption encrypts data at the application layer, but it does not ensure encryption in transit between the application and DAX; enabling encryption in transit on the DAX cluster is required.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Launch the DAX cluster in a private subnet with a VPC endpoint.
Why it's wrong here
Launching a DAX cluster in a private subnet with a VPC endpoint does not encrypt traffic; it only provides private connectivity. Encryption in transit must be explicitly enabled on the DAX cluster.
- ✓
Enable encryption in transit when creating the DAX cluster.
- ✗
Use AWS Certificate Manager to issue a certificate for the DAX cluster.
Why it's wrong here
DAX does not use ACM; it has its own certificate management.
- ✗
Use client-side encryption to encrypt data before sending it to DAX.
Why it's wrong here
Client-side encryption encrypts data before sending it to DAX, but this does not ensure that all traffic between the application and DAX is encrypted by DAX. To ensure all traffic is encrypted, enable encryption in transit on the DAX cluster.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DBS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this DBS-C01 question test?
Database Security — This question tests Database Security — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Enable encryption in transit when creating the DAX cluster. — Option B is correct. DAX supports encryption in transit, which must be enabled when creating the cluster. Option A is incorrect because launching in a private subnet with a VPC endpoint does not encrypt traffic; it only provides private connectivity. Option C is incorrect because DAX manages its own encryption certificates and does not use AWS Certificate Manager. Option D is incorrect because client-side encryption encrypts data at the application layer, but it does not ensure encryption in transit between the application and DAX; enabling encryption in transit on the DAX cluster is required.
What should I do if I get this DBS-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DBS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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