ANS-C01 Network Security, Compliance and Governance Practice Question
A network engineer needs to ensure that all traffic between two VPCs (VPC A and VPC B) is encrypted in transit. The VPCs are in the same region and are connected via a VPC peering connection. What should the engineer do?
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
✓
No additional action is required; all traffic over VPC peering is automatically encrypted.
VPC peering traffic within the same AWS region is automatically encrypted at the physical layer by AWS, ensuring data in transit is encrypted without additional configuration. Option A is incorrect because VPN over VPC peering is not supported and unnecessary. Option C is incorrect while application-level encryption like TLS can be added for extra security, it is not required as the traffic is already encrypted. Option D is incorrect because AWS Transit Gateway with VPN attachments adds unnecessary complexity and cost when VPC peering already provides encrypted connectivity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Establish a VPN connection between the VPCs over the peering connection.
Why it's wrong here
VPN over peering is not a supported configuration.
- ✓
No additional action is required; all traffic over VPC peering is automatically encrypted.
Why this is correct
AWS encrypts all traffic within the AWS network.
- ✗
Implement application-level encryption such as TLS.
Why it's wrong here
While this would work, it is not necessary because the physical network is already encrypted.
- ✗
Use AWS Transit Gateway with VPN attachments between VPCs.
Why it's wrong here
Transit Gateway does not add encryption for inter-VPC traffic beyond what peering provides.
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Same concept, more angles
1 more way this is tested on ANS-C01
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Variation 1. 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?
easy- A.Set up a VPN connection between the two VPCs and route traffic through it.
- B.Configure network ACLs to enforce encryption.
- ✓ C.No additional configuration needed; VPC peering traffic is automatically encrypted.
- D.Use AWS Transit Gateway to connect the VPCs and enable encryption.
Why C: VPC peering traffic within the same region is automatically encrypted using AWS's physical network encryption. No additional configuration is required. Option A (VPN) adds unnecessary complexity and cost since encryption already exists. Option B (NACLs) does not encrypt traffic. Option D (Transit Gateway) uses the same underlying encryption, so it does not add extra encryption beyond what VPC peering provides.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.