The correct answer is to enable encryption in transit on the ElastiCache Redis cluster. This ensures that all data moving between your application and the Redis cluster is encrypted using TLS, protecting session data from eavesdropping or man-in-the-middle attacks even within a private VPC. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding that network-level controls like security groups or VPC peering do not provide encryption—they only control access or connectivity. A common trap is assuming that placing resources in a VPC or using an Application Load Balancer automatically encrypts traffic, but ElastiCache requires you to explicitly enable the encryption-in-transit flag during cluster creation. Memory tip: think "TLS for transit, SG for gates"—security groups control who enters, but only encryption scrambles the data while it moves.
DVA-C02 Security Practice Question
This DVA-C02 practice question tests your understanding of 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 developer is building a web application that stores user session data in an ElastiCache Redis cluster. The cluster is in a VPC and is not publicly accessible. The developer needs to ensure that data in transit is encrypted. What should the developer do?
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 on the ElastiCache Redis cluster.
Option D is correct because enabling encryption in transit on the ElastiCache Redis cluster encrypts data between clients and the cluster. Option A is wrong because ElastiCache does not support TLS termination at the ALB. Option B is wrong because security groups do not encrypt traffic. Option C is wrong because VPC peering does not encrypt traffic by default.
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 encryption in transit on the ElastiCache Redis cluster.
Why this is correct
ElastiCache supports encryption in transit for Redis.
Related concept
Static NAT maps one inside address to one outside address.
✗
Place an Application Load Balancer in front of the Redis cluster and enable TLS termination.
Why it's wrong here
ElastiCache does not support ALB.
✗
Configure the security group to only allow traffic from the application servers.
Why it's wrong here
Security groups do not encrypt traffic.
✗
Use VPC peering to connect the application VPC to the ElastiCache VPC.
Why it's wrong here
VPC peering does not encrypt traffic.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 DVA-C02 NAT questions on configuration and troubleshooting.
Security — This question tests Security — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Enable encryption in transit on the ElastiCache Redis cluster. — Option D is correct because enabling encryption in transit on the ElastiCache Redis cluster encrypts data between clients and the cluster. Option A is wrong because ElastiCache does not support TLS termination at the ALB. Option B is wrong because security groups do not encrypt traffic. Option C is wrong because VPC peering does not encrypt traffic by default.
What should I do if I get this DVA-C02 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 DVA-C02 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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