Quick Answer
The answer is Cloud Router. This is the correct choice because Cloud Router is the VPC feature required when using Cloud VPN with dynamic routing (BGP), as it manages the BGP sessions between your on-premises router and the Cloud VPN gateway. Without Cloud Router, the VPN gateway cannot exchange routes dynamically; instead, you would be forced to rely on static routes, which defeats the purpose of dynamic routing and automatic failover. On the Google Professional Cloud Network Engineer exam, this question tests your understanding of how Cloud Router acts as the BGP speaker in Google Cloud, and a common trap is confusing Cloud VPN with Cloud Router—remember that the VPN gateway handles encryption, but Cloud Router handles route exchange. A helpful memory tip is: "Cloud Router routes, Cloud VPN encrypts."
This PCNE practice question tests your understanding of implementing a virtual private cloud. 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 is migrating to Google Cloud and requires connectivity between their on-premises network and VPC. They plan to use Cloud VPN with dynamic routing (BGP). Which VPC feature is required for this setup?
Cloud NAT
Why wrong: Cloud NAT provides internet access for private instances, not VPN routing.
VPC peering
Why wrong: VPC peering connects two VPCs, not on-premises to VPC.
Cloud Router
Cloud Router manages BGP sessions for dynamic routing with VPN or Interconnect.
VPC Flow Logs
Why wrong: Flow Logs record traffic metadata, not routing.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Cloud Router
Cloud Router is required when using Cloud VPN with dynamic routing (BGP) because it manages the BGP sessions between the on-premises router and the Google Cloud VPN gateway. It exchanges routes dynamically, enabling automatic route propagation and failover without manual static route configuration.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Cloud NAT
VPC peering
Why it's wrong here
VPC peering connects two VPCs, not on-premises to VPC.
Cloud Router
VPC Flow Logs
Why it's wrong here
Flow Logs record traffic metadata, not routing.
Common exam traps
The trap here is that candidates confuse Cloud Router with Cloud NAT or VPC peering, thinking any 'cloud' component or 'peering' term implies connectivity, but only Cloud Router handles the BGP dynamic routing required for Cloud VPN.
Detailed technical explanation
Cloud Router uses BGP to advertise and learn routes over the VPN tunnels, supporting features like graceful restart and route-based VPN failover. In a production scenario, you can configure multiple Cloud Routers with different ASNs for high availability, and BGP timers (e.g., hold time of 30 seconds) ensure fast convergence during link failures.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
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FAQ
Implementing a Virtual Private Cloud — This question tests Implementing a Virtual Private Cloud — Read the scenario before looking for a memorised answer..
The correct answer is: Cloud Router — Cloud Router is required when using Cloud VPN with dynamic routing (BGP) because it manages the BGP sessions between the on-premises router and the Google Cloud VPN gateway. It exchanges routes dynamically, enabling automatic route propagation and failover without manual static route configuration.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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