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.
An organization has multiple VPCs in different regions that need to connect to a single on-premises data center via Dedicated Interconnect. They want to minimize cost and complexity. What is the recommended architecture?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a single interconnect connection and use multiple VLAN attachments, one per VPC.
Option D is correct because a single Dedicated Interconnect connection can support multiple VLAN attachments (each with a unique VLAN ID) to connect multiple VPCs in different regions to the same on-premises data center. This minimizes cost by using one physical connection and reduces complexity by avoiding separate interconnects or VPNs for each VPC.
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.
✗
Use a single VPC and then use VPC Peering to connect to the other VPCs.
Why it's wrong here
VPC Peering does not provide transitive routing; on-premises would only reach the first VPC.
✗
Use Cloud VPN for the additional VPCs to avoid additional interconnect costs.
Why it's wrong here
VPN would add cost and complexity, and may not meet performance requirements.
✗
Create a separate interconnect connection for each VPC.
Why it's wrong here
Multiple physical connections increase cost and complexity unnecessarily.
✓
Create a single interconnect connection and use multiple VLAN attachments, one per VPC.
Why this is correct
One physical connection can support multiple VLAN attachments, each assigned to a different VPC.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume each VPC requires its own physical interconnect, but Cisco tests the understanding that a single Dedicated Interconnect can be partitioned into multiple VLAN attachments to serve multiple VPCs, reducing cost and complexity.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses a single physical cross-connect to Google's network, and VLAN attachments (using 802.1Q VLAN tagging) allow multiple virtual circuits to be provisioned over that single connection. Each VLAN attachment is associated with a Cloud Router and can connect to a VPC in any region, as long as the VPC is in the same project or a shared VPC host project. This architecture supports up to 8 VLAN attachments per interconnect connection by default, with a maximum of 10 Gbps per attachment.
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: Create a single interconnect connection and use multiple VLAN attachments, one per VPC. — Option D is correct because a single Dedicated Interconnect connection can support multiple VLAN attachments (each with a unique VLAN ID) to connect multiple VPCs in different regions to the same on-premises data center. This minimizes cost by using one physical connection and reduces complexity by avoiding separate interconnects or VPNs for each VPC.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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