PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
A company is setting up VPC peering between two VPCs. They need the peered VPC to be able to reach the entire subnets of their VPC, including those that may be added in the future. Which configuration is required?
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
✓
Enable 'Export custom routes' on the peering connection
Exporting custom routes from the VPC ensures that any future subnets (which create custom routes) are advertised to the peer.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable 'Export custom routes' on the peering connection
Why this is correct
Exporting custom routes advertises all custom routes (including future subnets) to the peered VPC.
- ✗
Create static routes in the peer VPC for each subnet
Why it's wrong here
Static routes would require manual updates for new subnets, not automated.
- ✗
Use a VPN instead of VPC peering
Why it's wrong here
A VPN is not needed; VPC peering with route export can achieve this.
- ✗
Enable 'Import custom routes' on the peering connection
Why it's wrong here
Import custom routes is used by the peer to receive custom routes; the exporting side must export.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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