The answer is creating a Cloud Router and VLAN attachment. These two components are required because Dedicated Interconnect operates at Layer 2 and Layer 3: the VLAN attachment establishes the logical link between your on-premises network and Google Cloud, while the Cloud Router enables dynamic BGP routing to exchange routes over that attachment. On the Google Professional Cloud Network Engineer exam, this question tests your understanding that the physical cross-connect alone is insufficient—you must also configure the software-defined networking layer. A common trap is assuming the physical interconnect setup is the only step, but the exam emphasizes that without a Cloud Router and VLAN attachment, traffic cannot be routed. For the dedicated interconnect setup steps, remember the mnemonic “PVC” — Physical cross-connect, VLAN attachment, Cloud Router — to ensure you never miss the two essential software components.
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 of the following are required steps to set up a Dedicated Interconnect?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an interconnect (physical connection) in the colocation facility
Creating an interconnect (physical connection) in the colocation facility is a required step because Dedicated Interconnect requires a direct, physical cross-connect between your on-premises router and a Google Cloud edge router at a colocation facility. This physical link is the foundation of the dedicated, high-bandwidth connection, and without it, no Layer 2 or Layer 3 connectivity can be established.
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 an interconnect (physical connection) in the colocation facility
Why this is correct
The physical cross-connect is necessary.
Related concept
Read the scenario before looking for a memorised answer.
Read the scenario before looking for a memorised answer.
✗
Deploy a Google-provided router in the colocation facility
Why it's wrong here
Customer provides own router.
✗
Configure MD5 authentication on the BGP session
Why it's wrong here
Authentication is optional.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that you must deploy a Google-provided router in the colocation facility, but in reality, you use your own router and Google provides only the edge router in their network.
Detailed technical explanation
How to think about this question
Dedicated Interconnect operates at Layer 2, using 802.1Q VLAN tagging to separate traffic, and requires a Cloud Router to establish BGP sessions (eBGP) with the on-premises router over the VLAN attachment. The VLAN attachment is a logical construct that maps the physical cross-connect to a Cloud Router, enabling dynamic route exchange via BGP. In real-world scenarios, you must ensure that the VLAN ID matches on both sides and that the BGP session uses private AS numbers (e.g., 64512-65534) to avoid conflicts with public BGP tables.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 an interconnect (physical connection) in the colocation facility — Creating an interconnect (physical connection) in the colocation facility is a required step because Dedicated Interconnect requires a direct, physical cross-connect between your on-premises router and a Google Cloud edge router at a colocation facility. This physical link is the foundation of the dedicated, high-bandwidth connection, and without it, no Layer 2 or Layer 3 connectivity can be established.
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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