The answer is that the organization must have a VLAN attachment created and share the pairing key. This is required because Partner Interconnect relies on a Layer 2 circuit that the service provider provisions, and the pairing key acts as a unique token linking the provider’s physical connection to your specific VLAN attachment in Google Cloud. Without the VLAN attachment already existing in your project and the key shared, the partner has no way to map their infrastructure to your VPC, making the connection impossible to establish. On the Google Professional Cloud Network Engineer exam, this question tests your understanding of the provisioning workflow, often catching candidates who assume the partner handles all setup or that a Cloud Router alone suffices. A common trap is confusing Dedicated Interconnect, where you provision the entire circuit yourself, with Partner Interconnect, where the partner needs your pairing key to complete the cross-connect. Remember the mnemonic “VLAN first, key shared” to recall that the customer must create the attachment and provide the key before the partner can act.
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 wants to connect their on-premises network to Google Cloud using Partner Interconnect. Which of the following is a requirement that must be met before the partner can provision the connection?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The organization must have a VLAN attachment created and share the pairing key.
Partner Interconnect requires the customer to create a VLAN attachment in their Google Cloud project and share the generated pairing key with the service provider. The partner uses this key to provision the connection on their side, ensuring the correct mapping to the customer's VPC. Without the VLAN attachment and pairing key, the partner cannot establish the Layer 2 circuit.
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.
✗
The organization must purchase a cross-connect at a colocation facility.
Why it's wrong here
Cross-connect is required for Dedicated Interconnect, not Partner Interconnect.
✗
The organization must have a Dedicated Interconnect connection already set up.
Why it's wrong here
Dedicated Interconnect is a different service; not required for Partner Interconnect.
✓
The organization must have a VLAN attachment created and share the pairing key.
Why this is correct
The VLAN attachment and pairing key are required for the partner to provision.
Related concept
Read the scenario before looking for a memorised answer.
✗
The organization must have a Cloud Router configured with BGP sessions.
Why it's wrong here
Cloud Router is needed but the direct requirement for partner provisioning is the VLAN attachment and pairing key.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between the prerequisites for Partner Interconnect versus Dedicated Interconnect, trapping candidates who confuse the cross-connect requirement (Dedicated) with the VLAN attachment and pairing key requirement (Partner).
Detailed technical explanation
How to think about this question
The pairing key is a unique, cryptographically generated string tied to the VLAN attachment's region and VPC network. When the partner provisions the connection, they use this key to associate their physical port with the correct Google Cloud VLAN, enabling Layer 2 connectivity. In real-world scenarios, if the pairing key is shared incorrectly or expires (keys have a 30-day validity), the partner cannot complete provisioning, causing delays.
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: The organization must have a VLAN attachment created and share the pairing key. — Partner Interconnect requires the customer to create a VLAN attachment in their Google Cloud project and share the generated pairing key with the service provider. The partner uses this key to provision the connection on their side, ensuring the correct mapping to the customer's VPC. Without the VLAN attachment and pairing key, the partner cannot establish the Layer 2 circuit.
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 →
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.