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 financial services firm needs to connect their on-premises data center to Google Cloud VPC with 50 Gbps of bandwidth and latency under 5 ms. They are in a metropolitan area with a Google Cloud region. They require an SLA of 99.99% and need to support VLAN attachments to multiple VPCs. Which connectivity option should they choose?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Dedicated Interconnect
Dedicated Interconnect is the correct choice because it provides direct, private connections between the on-premises data center and Google Cloud VPC, supporting up to 80 Gbps per interconnect (via 8 x 10 Gbps links) and offering a 99.99% SLA when configured with redundant links. It supports VLAN attachments (VLANs) to multiple VPCs, enabling segmentation across different environments, and meets the sub-5 ms latency requirement within a metropolitan area with a Google Cloud region.
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.
✗
Direct Peering
Why it's wrong here
Direct Peering does not offer VLAN attachments or an SLA.
✓
Dedicated Interconnect
Why this is correct
Dedicated Interconnect provides up to 100 Gbps per circuit, low latency, 99.99% SLA, and supports multiple VLAN attachments to different VPCs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud VPN with multiple tunnels and ECMP
Why it's wrong here
Cloud VPN is limited to 3 Gbps per tunnel and does not offer SLA.
✗
Partner Interconnect
Why it's wrong here
Partner Interconnect relies on a service provider and may not guarantee sub-5 ms latency or 50 Gbps bandwidth.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Cloud VPN with ECMP can scale to high bandwidths like 50 Gbps, but in reality, Cloud VPN is limited to 3 Gbps per tunnel and aggregate throughput is constrained by the underlying internet path and encryption overhead.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses IEEE 802.1Q VLAN tagging to create multiple VLAN attachments (VLANs) from a single physical connection, each mapped to a different VPC via Cloud Router and BGP sessions. The 99.99% SLA is achieved through redundant links (two or more) in different edge availability domains, with automatic failover via BGP path selection. In a metropolitan area, the physical fiber run is typically under 10 km, ensuring latency well below 5 ms, while the 50 Gbps requirement can be met by aggregating multiple 10 Gbps circuits (e.g., 5 x 10 Gbps) using LACP or ECMP over BGP.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Dedicated Interconnect — Dedicated Interconnect is the correct choice because it provides direct, private connections between the on-premises data center and Google Cloud VPC, supporting up to 80 Gbps per interconnect (via 8 x 10 Gbps links) and offering a 99.99% SLA when configured with redundant links. It supports VLAN attachments (VLANs) to multiple VPCs, enabling segmentation across different environments, and meets the sub-5 ms latency requirement within a metropolitan area with a Google Cloud region.
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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