PCNE Implementing Hybrid Interconnectivity Practice Question
A company with limited public IP addresses on-premises needs to connect to Google Cloud using Cloud VPN. They require high availability. Which solution should they implement?
⚠ Common exam trap
Google Cloud often tests the misconception that HA VPN can use the same on-premises public IP for both tunnels, but in reality, each tunnel must terminate on a separate on-premises device or interface with a unique public IP to achieve true high availability.
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 HA VPN with two on-premises public IPs and two tunnels.
HA VPN provides high availability by using two tunnels, each terminating on a separate on-premises VPN gateway with a unique public IP address. This ensures that if one on-premises public IP or tunnel fails, traffic can still flow through the other tunnel, meeting the high-availability requirement. Classic VPN (option B) does not support active-active failover, and using the same public IP for both tunnels (option D) creates a single point of failure at the on-premises side.
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 NAT to map multiple private IPs to one public IP.
Why it's wrong here
NAT is for address translation, not for creating redundant VPN endpoints.
- ✗
Use Classic VPN with a single tunnel.
Why it's wrong here
Classic VPN is not highly available and does not support dynamic routing.
- ✓
Use HA VPN with two on-premises public IPs and two tunnels.
Why this is correct
HA VPN provides redundancy by supporting active-active or active-passive with separate endpoints.
- ✗
Use HA VPN with the same public IP for both tunnels.
Why it's wrong here
Using the same IP defeats the purpose of redundancy; a single point of failure remains.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNE practice question is part of Courseiva's free Google Cloud 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 PCNE exam.