ANS-C01 Network Management and Operations Practice Question
A company is using AWS Transit Gateway with multiple VPC attachments. They need to ensure that traffic between two specific VPCs is encrypted in transit. The VPCs are in the same AWS region. What is the SIMPLEST solution?
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
✓
Create a VPN attachment on the Transit Gateway and route traffic through it
Creating a VPN attachment on the Transit Gateway and routing traffic through it provides encryption in transit between VPCs. The VPN attachment establishes an IPsec VPN tunnel over the AWS network, ensuring encryption. Option A is incorrect because Transit Gateway route tables do not provide encryption. Option B is incorrect because AWS PrivateLink is designed for accessing services, not for VPC-to-VPC encryption. Option D is incorrect because VPC peering does not encrypt traffic by default and is not the simplest solution.
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 on the Transit Gateway route tables
Why it's wrong here
Transit Gateway does not offer encryption.
- ✗
Use AWS PrivateLink to connect the VPCs
Why it's wrong here
PrivateLink is for service access, not VPC-to-VPC.
- ✓
Create a VPN attachment on the Transit Gateway and route traffic through it
Why this is correct
VPN provides encryption.
- ✗
Use VPC peering instead of Transit Gateway and enable encryption
Why it's wrong here
VPC peering does not support encryption.
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
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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.