Designing HA Cloud VPN with Two Gateways in Different Regions

A company needs to connect their on-premises data center to Google Cloud using a VPN with high availability. They have two VPN appliances on-premises in different locations. What is the best design on the GCP side?

Quick Answer

The correct design is to deploy two Cloud VPN gateways in different regions, each with a tunnel to a different on-premises appliance, using separate Cloud Routers. This configuration achieves true high availability cloud VPN design because it eliminates single points of failure at both the regional and gateway levels; if one GCP region or gateway goes down, the other region’s tunnel remains active, and using separate Cloud Routers with BGP enables automatic failover and dynamic route propagation. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of multi-region redundancy versus single-region HA, where a common trap is choosing a single gateway with multiple tunnels—that design protects against appliance failure but not regional outages. Remember the memory tip: “Two regions, two routers, two tunnels” ensures your VPN survives both a cloud region failure and an on-premises appliance failure simultaneously.

⚠ Common exam trap

Many candidates assume two tunnels from a single gateway provide high availability, but they overlook that the gateway itself is a single point of failure; true high availability requires redundancy at both the gateway and region level.

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

✓

Deploy two Cloud VPN gateways in different regions, each with a tunnel to a different on-premises appliance, using separate Cloud Routers.

It provides true high availability by using two Cloud VPN gateways in different regions, each with a tunnel to a different on-premises appliance. This design ensures that if one region or gateway fails, traffic can still flow through the other region, meeting the requirement for high availability. Using separate Cloud Routers allows for dynamic routing with BGP, enabling automatic failover and load balancing across the two tunnels.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Deploy one Cloud VPN gateway with two tunnels to both on-premises appliances, using one Cloud Router.
Why it's wrong here
Cloud Router and gateway are single points of failure.
✗
Deploy two Cloud VPN gateways in the same region, each with a tunnel to a different on-premises appliance, using separate Cloud Routers.
Why it's wrong here
Region failure affects both gateways.
✗
Deploy one Cloud VPN gateway with a single tunnel to one on-premises appliance.
Why it's wrong here
Single point of failure; not HA.
✓
Deploy two Cloud VPN gateways in different regions, each with a tunnel to a different on-premises appliance, using separate Cloud Routers.
Why this is correct
Provides regional redundancy and full HA.

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Same concept, more angles

1 more way this is tested on PCNE

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company is designing a hybrid network between their on-premises data center and Google Cloud. They need high availability for traffic between the two environments and want to use Cloud VPN with dynamic routing. Which configuration ensures that if one VPN tunnel fails, traffic automatically fails over to the other tunnel without manual intervention?

medium

A.Create one VPN tunnel and a static route with next hop set to the VPN gateway.
B.Use Cloud Interconnect instead of VPN, and configure two VLAN attachments.
✓ C.Create two VPN tunnels to two separate peer VPN gateways on-premises, and use Cloud Router with BGP to advertise routes from both tunnels.
D.Create two VPN tunnels to the same peer VPN gateway, and configure equal-cost multi-path (ECMP) routing with static routes.

Why C: It uses two VPN tunnels to separate on-premises peer gateways with Cloud Router and BGP. BGP automatically handles failover by withdrawing routes from the failed tunnel and advertising routes via the healthy tunnel, ensuring traffic fails over without manual intervention. This meets the high availability and dynamic routing requirements specified in the question.

Last reviewed: Jun 24, 2026

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