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 wants to migrate legacy on-premises applications to Google Cloud but must maintain low-latency connectivity for real-time data synchronization. The on-premises data center is in a colocation facility that is not directly served by Google Cloud. Which hybrid connectivity option is most cost-effective while meeting the latency requirement?
Direct Peering
Why wrong: Requires meeting Google's peering requirements and may not be available at all colocations.
Cloud VPN with dynamic routing
Why wrong: May have higher latency due to internet transit.
Partner Interconnect
Uses a service provider to connect to Google Cloud, cost-effective and low latency.
Dedicated Interconnect
Why wrong: Requires direct physical connection to Google Cloud edge.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Partner Interconnect
Partner Interconnect is the most cost-effective option because it provides a dedicated, low-latency connection through a supported service provider that can extend connectivity from the colocation facility to a Google Cloud region. Unlike Dedicated Interconnect, it does not require physical cross-connects in a Google Cloud colocation facility, making it ideal when the on-premises site is not directly served by Google Cloud. It meets the real-time synchronization latency requirement by offering a reliable, high-bandwidth connection with SLA-backed uptime.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Direct Peering
Why it's wrong here
Requires meeting Google's peering requirements and may not be available at all colocations.
Cloud VPN with dynamic routing
Why it's wrong here
May have higher latency due to internet transit.
Partner Interconnect
Why this is correct
Uses a service provider to connect to Google Cloud, cost-effective and low latency.
Related concept
Read the scenario before looking for a memorised answer.
Dedicated Interconnect
Why it's wrong here
Requires direct physical connection to Google Cloud edge.
Common exam traps
Google Cloud often tests the misconception that Direct Peering or Cloud VPN can meet low-latency requirements, but the trap here is that only Partner Interconnect or Dedicated Interconnect provide SLA-backed, low-latency connectivity, and Partner Interconnect is the correct choice when the on-premises site is not in a Google Cloud colocation facility.
Detailed technical explanation
Partner Interconnect leverages a supported service provider (e.g., Equinix, Megaport) to establish a VLAN attachment that extends Layer 2 or Layer 3 connectivity from the on-premises network to a Google Cloud VPC via a Cloud Router. The connection uses BGP for dynamic routing and supports up to 10 Gbps per attachment, with the ability to aggregate multiple attachments for higher throughput. In real-world scenarios, this is often used when the on-premises site is in a colocation facility that has a pre-existing relationship with a partner, avoiding the need for new physical infrastructure.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
The correct answer is: Partner Interconnect — Partner Interconnect is the most cost-effective option because it provides a dedicated, low-latency connection through a supported service provider that can extend connectivity from the colocation facility to a Google Cloud region. Unlike Dedicated Interconnect, it does not require physical cross-connects in a Google Cloud colocation facility, making it ideal when the on-premises site is not directly served by Google Cloud. It meets the real-time synchronization latency requirement by offering a reliable, high-bandwidth connection with SLA-backed uptime.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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