SAP-C02 Practice Question: Design Solutions for Organizational Complexity
A company has a multi-account AWS environment with a central networking account that hosts all VPCs and a shared services account that hosts common resources like directory services. The company wants to allow all accounts to use the same VPC for their workloads instead of creating separate VPCs. The security team requires that traffic between accounts is encrypted in transit and that accounts cannot directly access each other's resources without going through the central networking account. The network team proposes using AWS Transit Gateway with inter-region peering and VPC attachments. However, the security team is concerned about compliance with encryption requirements. What should the network team do to meet the requirements?
⚠ Common exam trap
Test-takers frequently assume VPC Peering or Direct Connect inherently meet encryption requirements, but VPC Peering does not encrypt traffic and Direct Connect requires an additional VPN layer for encryption, while Transit Gateway VPN attachments provide both encryption and centralized routing control.
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
✓
Use AWS Transit Gateway with VPN attachments between the central networking account and each member account VPC.
AWS Transit Gateway with VPN attachments enables encrypted traffic between the central networking account and each member account VPC using IPsec tunnels. This satisfies the encryption-in-transit requirement while ensuring all traffic routes through the central networking account, preventing direct account-to-account access. Transit Gateway also allows all accounts to share a single VPC for workloads without creating separate VPCs.
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 AWS Client VPN to connect each account to the central VPC.
Why it's wrong here
Not for VPC-to-VPC connectivity.
- ✗
Use VPC Peering between the central VPC and each member account VPC.
Why it's wrong here
No encryption in transit.
- ✗
Use AWS Direct Connect between accounts.
Why it's wrong here
Does not encrypt by default.
- ✓
Use AWS Transit Gateway with VPN attachments between the central networking account and each member account VPC.
Why this is correct
Provides IPsec encryption and centralized routing.
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 SAP-C02 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 SAP-C02 exam.