Google PCA Practice Question: Managing Implementation and Ensuring Solution and Operations Reliability
Your company uses Cloud VPN (HA VPN) to connect to Google Cloud. You need to achieve a 99.99% SLA for the VPN connection. What configuration is required?
⚠ Common exam trap
The trap is assuming that more tunnels on a single gateway equals higher availability — candidates must remember that the 99.99% SLA specifically requires two gateways with two tunnels each, not just four tunnels anywhere.
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 gateways, each with two tunnels, totaling four tunnels
To achieve the 99.99% SLA for HA VPN, Google Cloud requires two VPN gateways, each with two tunnels, for a total of four tunnels. This configuration provides redundancy across both gateways and tunnels, satisfying the availability requirement defined by Google's HA VPN SLA. A single gateway, even with multiple tunnels, cannot meet the 99.99% SLA.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
One VPN gateway with four tunnels to different on-premises devices
Why it's wrong here
Four tunnels on a single gateway still leave that gateway as a single point of failure, so 99.99% cannot be achieved. It is tempting because the tunnel count suggests resilience, and would be appropriate for 99.9% availability where only on-premises-side redundancy is needed.
- ✓
Two VPN gateways, each with two tunnels, totaling four tunnels
Why this is correct
Four tunnels across two HA VPN gateways satisfy the 99.99% SLA, since Google requires at least two tunnels on distinct gateways to guarantee that tier. Each gateway provides redundancy, so a single gateway or tunnel failure does not drop the connection, meeting the stem's availability constraint.
- ✗
Two VPN gateways, each with one tunnel, using two different edge availability domains
Why it's wrong here
Two gateways each carrying one tunnel provide no redundancy within a gateway; 99.99% requires two tunnels on each of two gateways across distinct edge availability domains. It is tempting because two gateways appear highly available, and would be correct for 99.9% SLA designs.
- ✗
One VPN gateway with two tunnels to the same on-premises device
Why it's wrong here
Two tunnels terminating on one on-premises device share that device as a single failure domain, so the 99.99% SLA cannot be met. It is tempting because two tunnels look redundant, and would suffice for 99.9% availability where on-premises hardware redundancy is not required.
Go deeper
Related to this question
Key term
SLA
A Service Level Agreement (SLA) is a contract between a service provider and a customer that defines the level of service expected, including metrics like uptime, response time, and penalties for non-compliance.
Key term
VPN connection
A VPN connection creates a secure, encrypted tunnel between a device and a remote network over the public internet, protecting data from eavesdropping.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Google Cloud exam blueprint
This PCA 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 PCA exam.