ANS-C01 Network Management and Operations Practice Question
Which THREE factors should be considered when designing a highly available AWS Site-to-Site VPN connection?
⚠ Common exam trap
AWS often tests the misconception that using two tunnels with the same customer gateway IP (Option A) provides redundancy, but the trap is that this still creates a single point of failure at the customer gateway device itself, whereas true high availability requires separate customer gateway IPs (Option C) and redundant gateways (Option E).
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
✓
Enable BGP for dynamic route propagation
BGP (Border Gateway Protocol) enables dynamic route propagation across the VPN tunnels, allowing automatic failover and route convergence if one tunnel goes down. This is critical for high availability because it eliminates the need for manual route updates and supports path selection based on BGP attributes, ensuring traffic is rerouted through the remaining healthy tunnel.
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 two VPN tunnels with the same customer gateway IP
Why it's wrong here
Using the same IP creates a single point of failure at the customer gateway.
- ✓
Enable BGP for dynamic route propagation
Why this is correct
BGP provides automatic failover and route propagation.
- ✓
Use two VPN tunnels each with a different customer gateway IP
Why this is correct
This provides redundancy at the customer side.
- ✗
Use a single VPN tunnel with a static route
Why it's wrong here
Single tunnel is not highly available.
- ✓
Configure redundant customer gateways
Why this is correct
Redundant customer gateways ensure that if one fails, the other can take over.
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.
Go deeper
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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.