PCNE Configuring Network Services Practice Question
A large organization uses Shared VPC with multiple service projects. They have an on-premises network connected via Cloud Interconnect. They want the on-premises network to be able to reach instances in all service projects. What is the recommended configuration?
⚠ Common exam trap
Google Cloud often tests the misconception that each service project needs its own interconnect or NAT configuration, but the key is that Shared VPC centralizes networking in the host project, so a single Cloud Router with BGP advertisement in the host project provides connectivity to all service project instances.
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
✓
Configure Cloud Router in the host project to advertise all subnets via BGP.
In a Shared VPC architecture, the host project owns the VPC network and subnets, and Cloud Router with BGP is used to advertise the subnets from the host project to the on-premises network over Cloud Interconnect. This allows the on-premises network to reach instances in all service projects, as those instances reside in the host project's subnets. Cloud Router dynamically advertises the host project's VPC subnets via BGP, enabling seamless Layer 3 connectivity without additional per-service-project configurations.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure Cloud NAT in each service project for on-prem access.
Why it's wrong here
Cloud NAT is for outbound internet, not for on-prem connectivity.
- ✗
Use VPC peering between the host project and each service project.
Why it's wrong here
In Shared VPC, service projects share the host's VPC, so peering is unnecessary.
- ✓
Configure Cloud Router in the host project to advertise all subnets via BGP.
Why this is correct
Cloud Router in the host project automatically includes subnets from all service projects in the Shared VPC.
- ✗
Create separate Interconnect VLAN attachments for each service project.
Why it's wrong here
This adds complexity and cost; a single VLAN attachment to the host VPC is sufficient.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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