This DOP-C02 practice question tests your understanding of security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 DevOps team uses AWS CodePipeline to deploy a web application. The application stores user session data in an ElastiCache Redis cluster. The security team mandates that all data in transit between the application and Redis must be encrypted. What should the team 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 and configure the application to use TLS.
Option D is correct because ElastiCache Redis supports encryption in transit using TLS, which must be enabled at cluster creation. Option A is wrong because VPC peering does not encrypt traffic. Option B is wrong because NACLs do not encrypt. Option C is wrong because the application must use TLS, but the cluster must also be configured to support it.
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.
✗
Use a network ACL to allow only encrypted traffic on the Redis port.
Why it's wrong here
NACLs are stateless and do not inspect or encrypt traffic.
✗
Modify the application to use TLS when connecting to Redis.
Why it's wrong here
The application must support TLS, but the Redis cluster must also have encryption in transit enabled.
✗
Place the application and Redis cluster in the same VPC and use VPC peering.
Why it's wrong here
VPC peering does not encrypt data in transit.
✓
Enable encryption in transit on the ElastiCache Redis cluster and configure the application to use TLS.
Why this is correct
This ensures both sides support encryption in transit.
Related concept
Standard ACLs match source addresses.
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 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.
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 DOP-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable encryption in transit on the ElastiCache Redis cluster and configure the application to use TLS. — Option D is correct because ElastiCache Redis supports encryption in transit using TLS, which must be enabled at cluster creation. Option A is wrong because VPC peering does not encrypt traffic. Option B is wrong because NACLs do not encrypt. Option C is wrong because the application must use TLS, but the cluster must also be configured to support it.
What should I do if I get this DOP-C02 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 DOP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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