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.
A company with multiple VPCs in a Shared VPC environment wants to connect their on-premises network to all VPCs with high availability and minimal cost. They already have a Dedicated Interconnect. What is the most efficient solution?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the existing Dedicated Interconnect to create multiple VLAN attachments, one per VPC.
Option C is correct because a Dedicated Interconnect can support multiple VLAN attachments (each with a separate VLAN ID and BGP session) to connect to different VPCs in a Shared VPC environment. This approach leverages the existing physical connection, provides high availability through redundant attachments, and minimizes cost by avoiding additional circuits or VPN tunnels.
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 up Cloud VPN with dynamic routing to each VPC.
Why it's wrong here
Cloud VPN may not meet bandwidth requirements for all VPCs.
✗
Create an HA VPN gateway for each VPC and peer with on-prem.
Why it's wrong here
Multiple HA VPN gateways increase cost and are not as performant as Direct Interconnect.
✓
Use the existing Dedicated Interconnect to create multiple VLAN attachments, one per VPC.
Why this is correct
VLAN attachments allow a single interconnect to connect multiple VPCs efficiently.
Related concept
Read the scenario before looking for a memorised answer.
✗
Provision a new Partner Interconnect for each VPC.
Why it's wrong here
Partner Interconnect is more expensive and unnecessary when Dedicated Interconnect is available.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that a single Dedicated Interconnect can only connect to one VPC, leading candidates to incorrectly choose VPN-based solutions or additional interconnects.
Detailed technical explanation
How to think about this question
A Dedicated Interconnect uses 802.1Q VLAN tagging to create multiple logical connections (VLAN attachments) over a single physical circuit. Each VLAN attachment is associated with a Cloud Router and a BGP session, allowing traffic to be directed to a specific VPC. This design supports up to 8 VLAN attachments per interconnect (with a limit of 128 per connection), enabling cost-effective multi-VPC connectivity while maintaining high availability through redundant pairs.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Use the existing Dedicated Interconnect to create multiple VLAN attachments, one per VPC. — Option C is correct because a Dedicated Interconnect can support multiple VLAN attachments (each with a separate VLAN ID and BGP session) to connect to different VPCs in a Shared VPC environment. This approach leverages the existing physical connection, provides high availability through redundant attachments, and minimizes cost by avoiding additional circuits or VPN tunnels.
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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