ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 security engineer needs to ensure that all traffic between two VPCs in the same region is encrypted in transit. The VPCs are connected via a VPC peering connection. What should the engineer do to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No additional configuration needed; VPC peering traffic is automatically encrypted.
Option A is correct because VPC peering traffic is already encrypted automatically. Option B is wrong because VPN is not needed. Option C is wrong because Transit Gateway does not add encryption beyond what VPC peering provides. Option D is wrong because NACLs do not encrypt traffic.
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.
✗
Set up a VPN connection between the two VPCs and route traffic through it.
Why it's wrong here
Unnecessary as VPC peering is already encrypted.
✗
Configure network ACLs to enforce encryption.
Why it's wrong here
NACLs do not provide encryption.
✓
No additional configuration needed; VPC peering traffic is automatically encrypted.
Why this is correct
AWS encrypts inter-region VPC peering traffic by default.
Related concept
Standard ACLs match source addresses.
✗
Use AWS Transit Gateway to connect the VPCs and enable encryption.
Why it's wrong here
Transit Gateway does not inherently encrypt traffic.
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 ANS-C01 ACL questions on filtering logic and placement.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: No additional configuration needed; VPC peering traffic is automatically encrypted. — Option A is correct because VPC peering traffic is already encrypted automatically. Option B is wrong because VPN is not needed. Option C is wrong because Transit Gateway does not add encryption beyond what VPC peering provides. Option D is wrong because NACLs do not encrypt traffic.
What should I do if I get this ANS-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 ANS-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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Question Discussion
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