- A
Layer 3 connectivity requires a VLAN attachment of type PARTNER_PROVIDER
Why wrong: Incorrect. Layer 3 connectivity uses VLAN attachment type PARTNER, not PARTNER_PROVIDER.
- B
With Layer 2 connectivity, you must configure BGP sessions between your on-premises router and Cloud Router
Correct. In Layer 2 connectivity, you must configure BGP sessions between your on-premises router and Cloud Router.
- C
Both connectivity types support dynamic routing with BGP
Why wrong: Incorrect. While BGP is used in Layer 3, the service provider manages it, so the customer does not configure dynamic routing with BGP in Layer 3.
- D
With Layer 3 connectivity, the service provider manages BGP peering with your Cloud Router
Correct. In Layer 3 connectivity, the service provider manages BGP peering with your Cloud Router.
- E
Layer 2 connectivity requires a VLAN attachment of type PARTNER_PROVIDER
Correct. Layer 2 connectivity requires a VLAN attachment of type PARTNER_PROVIDER.
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.
You are setting up Partner Interconnect with a service provider that offers both Layer 2 and Layer 3 options. Your on-premises network uses BGP to exchange routes. Which THREE statements are true about the connectivity types? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
With Layer 2 connectivity, you must configure BGP sessions between your on-premises router and Cloud Router
In Google Cloud Partner Interconnect, Layer 2 connectivity provides a transparent VLAN extension, requiring you to configure and manage your own BGP sessions between your on-premises router and a Cloud Router (option B correct). Layer 3 connectivity offloads BGP management to the service provider, who peers with your Cloud Router (option D correct). Layer 2 uses a VLAN attachment of type PARTNER_PROVIDER (option E correct). Option A is incorrect because Layer 3 uses a VLAN attachment of type PARTNER, not PARTNER_PROVIDER. Option C is incorrect because while both connectivity types use BGP, in Layer 3 the provider manages the BGP sessions, so it does not involve direct customer configuration as implied by 'support dynamic routing with BGP' from the customer perspective.
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.
- ✗
Layer 3 connectivity requires a VLAN attachment of type PARTNER_PROVIDER
Why it's wrong here
Incorrect. Layer 3 connectivity uses VLAN attachment type PARTNER, not PARTNER_PROVIDER.
- ✓
With Layer 2 connectivity, you must configure BGP sessions between your on-premises router and Cloud Router
Why this is correct
Correct. In Layer 2 connectivity, you must configure BGP sessions between your on-premises router and Cloud Router.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Both connectivity types support dynamic routing with BGP
Why it's wrong here
Incorrect. While BGP is used in Layer 3, the service provider manages it, so the customer does not configure dynamic routing with BGP in Layer 3.
- ✓
With Layer 3 connectivity, the service provider manages BGP peering with your Cloud Router
Why this is correct
Correct. In Layer 3 connectivity, the service provider manages BGP peering with your Cloud Router.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Layer 2 connectivity requires a VLAN attachment of type PARTNER_PROVIDER
Why this is correct
Correct. Layer 2 connectivity requires a VLAN attachment of type PARTNER_PROVIDER.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse the attachment types (PARTNER vs PARTNER_PROVIDER) and who manages BGP sessions, incorrectly assuming that Layer 3 connectivity requires direct BGP configuration on the Cloud Router.
Detailed technical explanation
How to think about this question
In Partner Interconnect, Layer 2 attachments (type PARTNER_PROVIDER) present a direct VLAN to your on-premises router, requiring you to run eBGP sessions with your Cloud Router using private AS numbers and MD5 authentication. Layer 3 attachments (type PARTNER) rely on the service provider to terminate BGP on their side, acting as a BGP route reflector, which simplifies your configuration but reduces control over routing policies.
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.
Visual reference
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.
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FAQ
Questions learners often ask
What does this PCNE question test?
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: With Layer 2 connectivity, you must configure BGP sessions between your on-premises router and Cloud Router — In Google Cloud Partner Interconnect, Layer 2 connectivity provides a transparent VLAN extension, requiring you to configure and manage your own BGP sessions between your on-premises router and a Cloud Router (option B correct). Layer 3 connectivity offloads BGP management to the service provider, who peers with your Cloud Router (option D correct). Layer 2 uses a VLAN attachment of type PARTNER_PROVIDER (option E correct). Option A is incorrect because Layer 3 uses a VLAN attachment of type PARTNER, not PARTNER_PROVIDER. Option C is incorrect because while both connectivity types use BGP, in Layer 3 the provider manages the BGP sessions, so it does not involve direct customer configuration as implied by 'support dynamic routing with BGP' from the customer perspective.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
This PCNE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNE exam.
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