The answer is a VLAN attachment mapped to a VPC and a Cloud Router in the same region. These two components are necessary because the VLAN attachment defines the logical connection between your on-premises network and a specific VPC, while the Cloud Router enables dynamic BGP routing to exchange routes and establish connectivity over the Dedicated Interconnect circuit. On the Google Professional Cloud Network Engineer exam, this tests your understanding that a Cloud Router is not optional—it is required for dynamic routing, and the VLAN attachment must be explicitly mapped to a VPC to direct traffic. A common trap is assuming a VPN tunnel or static routes can replace the Cloud Router, but Dedicated Interconnect mandates BGP for redundancy and scalability. Remember the mnemonic “VLAN + Router = Interconnect” to recall that both the VLAN attachment and Cloud Router are prerequisites, and they must reside in the same region for the BGP session to work.
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO are necessary components for setting up Dedicated Interconnect? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Cloud Router in the same region as the VLAN attachment
A Cloud Router is required in the same region as the VLAN attachment to enable dynamic routing (BGP) between your on-premises network and Google Cloud VPC. The VLAN attachment must be mapped to a VPC to define which VPC network the interconnect circuit connects to, allowing traffic to flow between your on-premises network and Google Cloud resources.
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.
✗
A Cloud VPN tunnel for management traffic
Why it's wrong here
Management traffic does not require a separate VPN; it uses the interconnect itself.
A Cloud Router in the same region as the VLAN attachment
Why this is correct
Cloud Router handles BGP routing for the interconnect.
Related concept
Read the scenario before looking for a memorised answer.
✗
Two physical interconnect connections for redundancy
Why it's wrong here
Redundancy is best practice but not a necessary component for a single connection.
✓
A VLAN attachment mapped to a VPC
Why this is correct
VLAN attachment defines the connection to the VPC.
Related concept
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 Dedicated Interconnect requires a VPN tunnel for management or redundancy, when in fact the VPN tunnel is a separate service for encrypted connectivity and is not a component of Dedicated Interconnect setup.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses a VLAN attachment (also known as a 'VLAN attachment' or 'interconnect attachment') that terminates on a Cloud Router, which runs BGP sessions to exchange routes. The Cloud Router must be in the same region as the VLAN attachment because the attachment is a regional resource, and BGP peering is established at that regional endpoint. In a real-world scenario, if you attach a VLAN attachment to a VPC without a Cloud Router, no dynamic routing occurs, and traffic cannot be forwarded, making the setup non-functional.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: A Cloud Router in the same region as the VLAN attachment — A Cloud Router is required in the same region as the VLAN attachment to enable dynamic routing (BGP) between your on-premises network and Google Cloud VPC. The VLAN attachment must be mapped to a VPC to define which VPC network the interconnect circuit connects to, allowing traffic to flow between your on-premises network and Google Cloud resources.
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.
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Question Discussion
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