The correct three steps are to provision the Dedicated Interconnect and VLAN attachments, configure BGP sessions on the Interconnect, and then gradually withdraw VPN routes after verifying Interconnect traffic. This sequence works because the Interconnect must first exist as a physical and logical path before any BGP peering or route manipulation can shift traffic; once BGP is established and routes are advertised over the Interconnect, you can safely withdraw the VPN routes incrementally to avoid a black hole. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding of hybrid connectivity migration patterns and the importance of route priority with BGP, where a common trap is attempting to withdraw VPN routes before the Interconnect path is fully verified. Remember the memory tip: “Provision, Peer, then Pull” — always build the new link, establish BGP, and only then remove the old routes to ensure zero downtime during the migration.
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 has a Hybrid Connectivity setup using Cloud VPN with BGP. They want to migrate to Dedicated Interconnect for better performance. During the migration, they need to avoid downtime. Which THREE steps should they take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Provision the Dedicated Interconnect and VLAN attachments
Option C is correct because provisioning the Dedicated Interconnect and VLAN attachments is the foundational step to establish the new high-performance connection. Without this, there is no physical or logical path to migrate traffic onto. This must be done before any BGP configuration or route manipulation can occur.
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.
✗
Set a lower local preference on the Interconnect BGP session
Why it's wrong here
Would make Interconnect less preferred, causing traffic to stay on VPN.
✗
Remove the VPN tunnels immediately after Interconnect is up
Why it's wrong here
Should verify traffic flow before removal.
✓
Provision the Dedicated Interconnect and VLAN attachments
Why this is correct
Must have the Interconnect physical path ready.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure BGP on the Interconnect with a higher local preference than the VPN
Why this is correct
Higher local preference on Interconnect makes it preferred.
Related concept
Read the scenario before looking for a memorised answer.
✓
Gradually withdraw VPN routes after verifying Interconnect traffic
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 you should immediately remove the old connection (VPN tunnels) once the new one (Interconnect) is up, but the correct approach is to gracefully shift traffic using BGP attributes and then decommission the old path only after verification.
Detailed technical explanation
How to think about this question
BGP local preference is an attribute used to influence outbound traffic from the on-premises network toward Google Cloud; a higher local preference makes a path more preferred. During migration, you set a higher local preference on the Interconnect BGP session to attract traffic away from the VPN, then gradually withdraw VPN routes (e.g., by removing or deprioritizing the VPN BGP advertisements) after confirming that traffic is stable over the Interconnect. This ensures zero packet loss by maintaining a fallback path until the new connection is fully validated.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: Provision the Dedicated Interconnect and VLAN attachments — Option C is correct because provisioning the Dedicated Interconnect and VLAN attachments is the foundational step to establish the new high-performance connection. Without this, there is no physical or logical path to migrate traffic onto. This must be done before any BGP configuration or route manipulation can occur.
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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