The answer is a VLAN attachment. This is the correct Google Cloud resource because a VLAN attachment is the logical construct provisioned on a Cloud Interconnect connection managed by a supported service provider, defining both the VLAN ID and the Cloud Router configuration used to exchange routes via BGP. It directly connects your VPC network to the partner’s physical infrastructure, making it the essential bridge for Partner Interconnect. On the Google Professional Cloud Network Engineer exam, this concept tests your understanding of how hybrid connectivity is logically segmented—expect questions that ask you to distinguish a VLAN attachment from the underlying physical interconnect or from Dedicated Interconnect. A common trap is confusing the VLAN attachment with the Cloud Router itself; remember that the attachment is the resource that *uses* the Cloud Router to establish BGP sessions. Memory tip: think of the VLAN attachment as the “logical plug” that snaps into the partner’s physical socket, carrying your VLAN and BGP configuration.
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.
When setting up a Partner Interconnect, which Google Cloud resource is used to connect to the partner's network?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
VLAN attachment
When setting up a Partner Interconnect, the correct Google Cloud resource is a VLAN attachment. This attachment is provisioned on a Cloud Interconnect connection that is managed by a supported service provider, and it defines the VLAN and the Cloud Router configuration used to exchange routes via BGP. The VLAN attachment is the logical construct that connects your VPC network to the partner's network through the partner's physical infrastructure.
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.
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Cloud VPN gateway
Why it's wrong here
Cloud VPN is for IPSec tunnels, not for partner interconnect.
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Cloud Interconnect attachment
Why it's wrong here
For partner interconnect, the attachment is called a VLAN attachment, not Cloud Interconnect attachment.
✓
VLAN attachment
Why this is correct
A VLAN attachment is the logical connection between Google Cloud and the partner's network.
Related concept
Read the scenario before looking for a memorised answer.
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Cloud Router
Why it's wrong here
Cloud Router manages BGP sessions and routing but is not the connection point.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between the physical connection (Dedicated Interconnect or Partner Interconnect) and the logical attachment (VLAN attachment), so candidates mistakenly select 'Cloud Interconnect attachment' as a generic term instead of the precise 'VLAN attachment' resource name used in Google Cloud.
Detailed technical explanation
How to think about this question
Under the hood, a VLAN attachment creates an 802.1Q VLAN trunk between the partner's edge router and a Google Cloud router, with a unique VLAN ID (typically in the range 1–4094) and a Cloud Router that establishes one or more BGP sessions (using eBGP with ASN 16550 for Google). A real-world scenario: if you need 10 Gbps of throughput and your partner only supports 1 Gbps per VLAN, you would create multiple VLAN attachments (each with its own VLAN ID and BGP session) to aggregate bandwidth, which is a common design for high-availability or high-throughput hybrid connectivity.
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: VLAN attachment — When setting up a Partner Interconnect, the correct Google Cloud resource is a VLAN attachment. This attachment is provisioned on a Cloud Interconnect connection that is managed by a supported service provider, and it defines the VLAN and the Cloud Router configuration used to exchange routes via BGP. The VLAN attachment is the logical construct that connects your VPC network to the partner's network through the partner's physical infrastructure.
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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