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.
Which THREE of the following are requirements for setting up a Dedicated Interconnect connection to Google Cloud? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A Layer 2 circuit between the on-premises router and Google's edge router.
Option A is correct because a Dedicated Interconnect requires a Layer 2 circuit (e.g., Ethernet VLAN) that directly connects your on-premises router to a Google edge router at a colocation facility. This Layer 2 link provides the physical or virtual circuit over which BGP sessions are established to exchange routes between your network and Google Cloud.
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.
✓
A Layer 2 circuit between the on-premises router and Google's edge router.
Why this is correct
The connection operates at Layer 2.
Related concept
Read the scenario before looking for a memorised answer.
✗
A public IP address on the on-premises router for BGP peering.
Why it's wrong here
Private IP addresses (169.254.x.x) are used for BGP peering over the interconnect.
✗
BGP sessions must be configured directly on the VLAN attachment.
Why it's wrong here
BGP is configured on the Cloud Router associated with the VLAN attachment.
✓
A physical cross-connect in a colocation facility that supports Google Cloud Interconnect.
Why this is correct
The cross-connect is the physical fiber connection.
Related concept
Read the scenario before looking for a memorised answer.
✓
A VLAN attachment (VLAN) configured in Google Cloud to connect to a VPC.
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 BGP sessions are configured directly on the VLAN attachment, when in fact they are configured on the Cloud Router, which uses the VLAN attachment as the underlying Layer 2 transport.
Detailed technical explanation
How to think about this question
Dedicated Interconnect relies on a cross-connect in a supported colocation facility (Option D) to establish physical connectivity, and a VLAN attachment (Option E) in Google Cloud to map that connectivity to a VPC network. The BGP peering uses private IP addresses from the link-local range (169.254.0.0/16) or a /29 subnet you assign, and the Cloud Router manages multiple BGP sessions for redundancy and traffic steering.
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: A Layer 2 circuit between the on-premises router and Google's edge router. — Option A is correct because a Dedicated Interconnect requires a Layer 2 circuit (e.g., Ethernet VLAN) that directly connects your on-premises router to a Google edge router at a colocation facility. This Layer 2 link provides the physical or virtual circuit over which BGP sessions are established to exchange routes between your network and Google Cloud.
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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