PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
An organization uses Dedicated Interconnect with VLAN attachments in multiple regions. They need to ensure that traffic from one region to another flows over the interconnect backbone instead of the internet. Which configuration is required?
⚠ Common exam trap
Candidates often assume Network Connectivity Center is required for inter-region traffic over interconnect, but the actual requirement is simply enabling global routing mode on the VPC. This setting controls route propagation scope and ensures routes learned via BGP over the interconnect are propagated to all regions.
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 global routing mode on the VPC
C is correct because enabling global routing mode on the VPC allows the VPC to use the same Dedicated Interconnect VLAN attachments across all regions. With global routing, routes learned via BGP over the interconnect are propagated to every region, ensuring that inter-region traffic is forwarded through the interconnect backbone rather than the public internet. Without global routing, each region would have its own VPC and would not share the interconnect routes, causing traffic to egress via the internet.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Partner Interconnect instead
Why it's wrong here
Partner Interconnect doesn't change routing behavior.
- ✗
Configure Network Connectivity Center
Why it's wrong here
NCC is for hub-and-spoke, not required for this.
- ✓
Enable global routing mode on the VPC
Why this is correct
Global routing mode ensures routes are propagated to all regions, allowing cross-region traffic over backbone.
- ✗
Set BGP MED values on Cloud Router
Why it's wrong here
MED influences path selection but doesn't enable cross-region backbone routing.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.