Google ACE Practice Question: Ensuring successful operation of a cloud solution
This ACE practice question tests your understanding of ensuring successful operation of a cloud solution. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An organization has a VPC with subnets in us-central1 and europe-west1. They want to allow traffic from a specific on-premises IP range to reach a Compute Engine instance in europe-west1, but only through a single Cloud VPN tunnel attached to the us-central1 gateway. What configuration is required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a route in us-central1 with the on-premises range and next hop set to the VPN tunnel. Add a firewall rule allowing the traffic.
Option A is correct because the VPN tunnel is attached to the us-central1 gateway, and a static route in us-central1 with the on-premises IP range as the destination and the VPN tunnel as the next hop directs traffic from the on-premises network to the VPC. Since the VPC is global, the route applies to all regions, and the Compute Engine instance in europe-west1 is reachable as long as the traffic enters the VPC through the us-central1 tunnel. A firewall rule is required to allow the inbound traffic from the on-premises range to the instance.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Create a route in us-central1 with the on-premises range and next hop set to the VPN tunnel. Add a firewall rule allowing the traffic.
Why this is correct
This routes traffic through the desired tunnel.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use policy-based routing on the Cloud VPN gateway to route the traffic to europe-west1.
Create a static route for the on-premises range in the europe-west1 subnet pointing to the VPN tunnel in us-central1.
Why it's wrong here
Routes are regional; a route in europe-west1 cannot point to a resource in another region.
✗
Configure the VPN tunnel with BGP to advertise the on-premises range to both regions.
Why it's wrong here
BGP does not force traffic through a single tunnel.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume routes must be created in the same region as the destination instance, but in a global VPC, a route in one region can direct traffic to instances in another region as long as the next hop is valid and the traffic enters through the correct gateway.
Detailed technical explanation
How to think about this question
In Google Cloud VPC, routes are global resources, but the next hop for a VPN tunnel must be a gateway in the same region as the route's origin. When traffic from on-premises enters the VPC through the us-central1 tunnel, it can reach any instance in any region because the VPC network spans all regions. The firewall rule must be applied to the VPC or the specific instance to allow the traffic, as routes only control forwarding, not access. This setup ensures that all on-premises traffic is inspected and routed through a single point of entry, which is common for centralized security or compliance requirements.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this ACE question in full detail.
Ensuring successful operation of a cloud solution — This question tests Ensuring successful operation of a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a route in us-central1 with the on-premises range and next hop set to the VPN tunnel. Add a firewall rule allowing the traffic. — Option A is correct because the VPN tunnel is attached to the us-central1 gateway, and a static route in us-central1 with the on-premises IP range as the destination and the VPN tunnel as the next hop directs traffic from the on-premises network to the VPC. Since the VPC is global, the route applies to all regions, and the Compute Engine instance in europe-west1 is reachable as long as the traffic enters the VPC through the us-central1 tunnel. A firewall rule is required to allow the inbound traffic from the on-premises range to the instance.
What should I do if I get this ACE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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