The answer is to provision additional VLAN attachments on the existing Partner Interconnect. This is correct because Partner Interconnect uses a service provider-managed physical circuit, and increasing capacity does not require replacing that underlying connection; instead, you simply add more VLAN attachments to the existing logical link, which allows the throughput to scale up to 20 Gbps while maintaining low-latency connectivity. On the Google Professional Cloud Network Engineer exam, this scenario tests your understanding that Partner Interconnect capacity is elastic and tied to VLAN attachments, not the physical handoff—a common trap is assuming you must order a new Dedicated Interconnect or a second Partner connection. The key distinction is that the service provider handles the physical upgrade, so you only need to adjust the logical configuration in Google Cloud. Memory tip: think of VLAN attachments as lanes on a highway—adding more lanes increases traffic flow without building a new road.
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.
An organization needs low-latency connectivity between their on-premises data center and Google Cloud, supporting up to 20 Gbps throughput. They already have a Partner Interconnect connection but need to increase capacity. Which two actions should they take? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Work with the service provider to upgrade the existing interconnect to a higher capacity
Option A is correct because Partner Interconnect connections can be upgraded to higher capacity by working with the service provider, as the provider manages the underlying physical circuit. This allows increasing throughput up to 20 Gbps without replacing the existing connection, leveraging the existing Layer 2 or Layer 3 handoff.
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.
✓
Work with the service provider to upgrade the existing interconnect to a higher capacity
Why this is correct
Partner Interconnect bandwidth can be upgraded with provider.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create additional Cloud VPN tunnels to the same region
Why it's wrong here
VPN tunnels do not increase Interconnect capacity.
✗
Provision a new Dedicated Interconnect to bypass the partner
Why it's wrong here
Dedicated Interconnect is a separate connection, not an upgrade from Partner.
✓
Provision additional VLAN attachments on the existing Partner Interconnect
Why this is correct
Multiple VLAN attachments can be used to increase bandwidth.
Related concept
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 adding Cloud VPN tunnels can scale throughput to match Interconnect speeds, but VPN tunnels have lower bandwidth limits and higher latency, making them unsuitable for high-throughput, low-latency requirements.
Detailed technical explanation
How to think about this question
Partner Interconnect uses a service provider's network to extend GCP's VPC to on-premises, with VLAN attachments (VLANs) provisioned on the provider's connection. Each VLAN attachment supports up to 10 Gbps by default, and multiple attachments can be used for load balancing or failover, but total throughput is limited by the underlying physical circuit. Upgrading the circuit with the provider increases the aggregate capacity, while adding VLAN attachments distributes traffic across multiple logical links.
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: Work with the service provider to upgrade the existing interconnect to a higher capacity — Option A is correct because Partner Interconnect connections can be upgraded to higher capacity by working with the service provider, as the provider manages the underlying physical circuit. This allows increasing throughput up to 20 Gbps without replacing the existing connection, leveraging the existing Layer 2 or Layer 3 handoff.
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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