The answer is that you must provision a separate VLAN attachment for each VPC and create a dedicated Cloud Router per VPC. This is required because Dedicated Interconnect provides a single physical connection to your on-premises network, but each VPC needs its own logical termination point—the VLAN attachment—to isolate traffic and routing domains. The Cloud Router, which is a per-VPC resource, then establishes independent BGP sessions over that attachment, allowing each VPC to exchange routes with your on-premises routers without interfering with one another. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of how to scale hybrid connectivity across multiple VPCs and regions while avoiding the common trap of assuming a single Cloud Router can serve all VPCs. Remember the key rule: one VLAN attachment and one Cloud Router per VPC, even when sharing the same physical interconnect. A helpful memory tip is “One VPC, one router, one VLAN—share the wire, not the brain.”
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. 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.
A company is planning to connect multiple VPCs in different regions to their on-premises network using a single Dedicated Interconnect. Which TWO configurations are required to achieve this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a Cloud Router in each VPC
Option C is correct because each VPC requires its own Cloud Router to establish dynamic routing (BGP) over the Dedicated Interconnect. A Cloud Router is a per-VPC resource that manages BGP sessions and routes for that specific VPC, and since the interconnect is shared, each VPC must have its own router to participate in routing independently.
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.
✗
Create a single Cloud Router for all VPCs
Why it's wrong here
A Cloud Router is attached to a single VPC.
✗
Set up Cloud VPN tunnels for regional connectivity
Why it's wrong here
VPN is not needed; Interconnect can connect multiple VPCs with multiple VLAN attachments.
✓
Create a Cloud Router in each VPC
Why this is correct
Each VPC needs its own Cloud Router to establish BGP sessions.
Related concept
Read the scenario before looking for a memorised answer.
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that a single Cloud Router or global VLAN attachment can serve multiple VPCs across regions, but in reality, each VPC requires its own regional Cloud Router and VLAN attachment for Dedicated Interconnect.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses VLAN attachments (VLANs) to segment traffic for different VPCs over the same physical connection. Each VLAN attachment is associated with a specific Cloud Router in a specific region, and BGP sessions are established per Cloud Router to exchange routes. For multi-region connectivity, you must provision separate VLAN attachments and Cloud Routers in each region, ensuring that traffic is correctly routed to the appropriate VPC and on-premises network.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a Cloud Router in each VPC — Option C is correct because each VPC requires its own Cloud Router to establish dynamic routing (BGP) over the Dedicated Interconnect. A Cloud Router is a per-VPC resource that manages BGP sessions and routes for that specific VPC, and since the interconnect is shared, each VPC must have its own router to participate in routing independently.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company with multiple VPCs in a Shared VPC environment wants to connect their on-premises network to all VPCs with high availability and minimal cost. They already have a Dedicated Interconnect. What is the most efficient solution?
hard
A.Set up Cloud VPN with dynamic routing to each VPC.
B.Create an HA VPN gateway for each VPC and peer with on-prem.
✓ C.Use the existing Dedicated Interconnect to create multiple VLAN attachments, one per VPC.
D.Provision a new Partner Interconnect for each VPC.
Why C: Option C is correct because a Dedicated Interconnect can support multiple VLAN attachments (each with a separate VLAN ID and BGP session) to connect to different VPCs in a Shared VPC environment. This approach leverages the existing physical connection, provides high availability through redundant attachments, and minimizes cost by avoiding additional circuits or VPN tunnels.
Last reviewed: Jun 30, 2026
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.