- A
Create a second Cloud VPN tunnel on the existing Cloud VPN gateway to Europe with a new BGP session, and update the on-premises router to accept the new route advertisement.
Why wrong: The existing VPN gateway is in us-central1; creating a tunnel through it would still route traffic to us-central1, not europe-west1, causing higher latency.
- B
Set up VPC Network Peering between the us-central1 and europe-west1 VPCs to allow cross-region communication.
Why wrong: Peering is for connecting separate VPCs, not for connecting on-premises; it would not help with on-premises connectivity.
- C
Create a new Cloud VPN gateway in europe-west1, attach it to a Cloud Router, and establish a BGP session with the on-premises router. Use route priority or metrics to gradually shift traffic to europe-west1.
This allows incremental migration with minimal downtime; on-premises router learns new routes for europe-west1 subnets.
- D
Provision a Dedicated Interconnect connection to europe-west1 and attach a new Cloud Router. Remove the existing Cloud VPN gateway.
Why wrong: Dedicated Interconnect requires physical setup and is not a quick change; also, removing the existing gateway would cause downtime.
Google ACE Setting up a cloud solution environment Practice Question
This ACE practice question tests your understanding of setting up a cloud solution environment. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
A company has 50+ Compute Engine instances running a stateful application in the us-central1 region. The instances are part of a managed instance group behind an internal load balancer. The application stores data on zonal persistent disks. The company wants to migrate the entire application stack to the europe-west1 region to reduce latency for European users. They have a Cloud VPN tunnel between their on-premises data center and us-central1. They want to extend connectivity to europe-west1 with minimal downtime. The current on-premises router uses BGP to advertise a specific CIDR block (10.0.0.0/8) to Google Cloud. The VPC is in custom mode with subnets in us-central1 and europe-west1 already created. The Cloud VPN gateway in us-central1 is attached to a Cloud Router with a BGP session to the on-premises router. Which course of action should the company take to achieve the migration with minimal downtime?
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
Create a new Cloud VPN gateway in europe-west1, attach it to a Cloud Router, and establish a BGP session with the on-premises router. Use route priority or metrics to gradually shift traffic to europe-west1.
Option C is correct because adding a second Cloud VPN gateway in europe-west1 and configuring a new BGP session to the on-premises router allows the on-premises router to learn routes for europe-west1 subnets and route traffic accordingly. This can be done without modifying existing sessions, and traffic can be shifted gradually by adjusting route priority (MED) or using BGP metrics. Option A is wrong because a second VPN tunnel on the same gateway would still be in us-central1 and might not provide optimal routing. Option B is wrong because Cloud Interconnect is a dedicated connection that requires physical setup and is not suitable for a quick migration. Option D is wrong because VPC Network Peering does not connect on-premises to cloud.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 second Cloud VPN tunnel on the existing Cloud VPN gateway to Europe with a new BGP session, and update the on-premises router to accept the new route advertisement.
- ✗
Set up VPC Network Peering between the us-central1 and europe-west1 VPCs to allow cross-region communication.
Why it's wrong here
Peering is for connecting separate VPCs, not for connecting on-premises; it would not help with on-premises connectivity.
- ✓
Create a new Cloud VPN gateway in europe-west1, attach it to a Cloud Router, and establish a BGP session with the on-premises router. Use route priority or metrics to gradually shift traffic to europe-west1.
Why this is correct
This allows incremental migration with minimal downtime; on-premises router learns new routes for europe-west1 subnets.
Related concept
CIDR notation defines the prefix length.
- ✗
Provision a Dedicated Interconnect connection to europe-west1 and attach a new Cloud Router. Remove the existing Cloud VPN gateway.
Why it's wrong here
Dedicated Interconnect requires physical setup and is not a quick change; also, removing the existing gateway would cause downtime.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ACE subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this ACE question test?
Setting up a cloud solution environment — This question tests Setting up a cloud solution environment — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a new Cloud VPN gateway in europe-west1, attach it to a Cloud Router, and establish a BGP session with the on-premises router. Use route priority or metrics to gradually shift traffic to europe-west1. — Option C is correct because adding a second Cloud VPN gateway in europe-west1 and configuring a new BGP session to the on-premises router allows the on-premises router to learn routes for europe-west1 subnets and route traffic accordingly. This can be done without modifying existing sessions, and traffic can be shifted gradually by adjusting route priority (MED) or using BGP metrics. Option A is wrong because a second VPN tunnel on the same gateway would still be in us-central1 and might not provide optimal routing. Option B is wrong because Cloud Interconnect is a dedicated connection that requires physical setup and is not suitable for a quick migration. Option D is wrong because VPC Network Peering does not connect on-premises to cloud.
What should I do if I get this ACE question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related ACE subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Last reviewed: Jun 23, 2026
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