- A
Use Partner Interconnect instead
Why wrong: Partner Interconnect doesn't change routing behavior.
- B
Configure Network Connectivity Center
Why wrong: NCC is for hub-and-spoke, not required for this.
- C
Enable global routing mode on the VPC
Global routing mode ensures routes are propagated to all regions, allowing cross-region traffic over backbone.
- D
Set BGP MED values on Cloud Router
Why wrong: MED influences path selection but doesn't enable cross-region backbone routing.
Question 45 of 1,000
PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
This PCNE practice question tests your understanding of designing, planning, and prototyping a gcp network. 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 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?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Set BGP MED values on Cloud Router
Why it's wrong here
MED influences path selection but doesn't enable cross-region backbone routing.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
When global routing mode is enabled on a VPC, the VPC's dynamic routes (including those learned via BGP from Cloud Router over Dedicated Interconnect) are propagated to all subnets in every region. This allows the VPC to use the interconnect as a transit path for inter-region traffic, effectively creating a private network backbone. In contrast, regional routing mode restricts route propagation to the region where the BGP session is established, so traffic between regions would default to the internet unless explicit custom routes or VPNs are configured.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Visual reference
What to study next
Got this wrong? Here's your next step.
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Designing, Planning, and Prototyping a GCP Network — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Designing, Planning, and Prototyping a GCP Network — This question tests Designing, Planning, and Prototyping a GCP Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 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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