ANS-C01 Network Implementation Practice Question
A company is implementing a hybrid network using AWS Site-to-Site VPN. The on-premises firewall requires that the VPN tunnels use IKEv2 with pre-shared keys and that the tunnels are always active. Which VPN configuration should be used?
⚠ Common exam trap
Test-takers frequently assume active/passive mode is required for redundancy, but the question explicitly states 'tunnels are always active,' which mandates active/active mode with BGP to keep both tunnels up and forwarding traffic simultaneously.
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
✓
Two VPN tunnels in active/active mode with BGP
IKEv2 with pre-shared keys and always-active tunnels require both tunnels to be in active/active mode, which is achieved by using BGP to advertise the same routes over both tunnels. BGP enables dynamic routing and ensures both tunnels are used simultaneously, meeting the requirement for continuous active 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.
- ✗
Two VPN tunnels in active/passive mode
Why it's wrong here
Active/passive means one tunnel is not always active.
- ✗
Two VPN tunnels with static routing
Why it's wrong here
Static routing is less flexible than dynamic routing for failover.
- ✗
One VPN tunnel with static routing
Why it's wrong here
A single tunnel lacks redundancy.
- ✓
Two VPN tunnels in active/active mode with BGP
Why this is correct
Active/active tunnels with BGP provide high availability and always-on connectivity.
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.