The answer is to create a VLAN attachment for the Interconnect connection and configure the BGP peer IP address and on-premises ASN on the Cloud Router. This is correct because Cloud Router uses BGP to dynamically exchange routes over Dedicated Interconnect, and the VLAN attachment provides the Layer 2 circuit that carries the BGP session between Google Cloud and your on-premises router. Without the VLAN attachment, there is no physical or logical path for the BGP traffic, and without specifying the peer IP and ASN, the BGP session cannot be established. On the Google Professional Cloud Network Engineer exam, this question tests your understanding that Dedicated Interconnect requires both a VLAN attachment and explicit BGP peering configuration—a common trap is thinking that simply enabling Cloud Router is enough. Remember the pairing: VLAN attachment for the link, BGP peer config for the route exchange. A useful memory tip is “Link first, then speak BGP.”
PCNE Configuring network services Practice Question
This PCNE practice question tests your understanding of configuring network services. 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 network engineer is designing a hybrid cloud architecture connecting an on-premises data center to Google Cloud via Dedicated Interconnect. The on-premises network uses BGP for dynamic routing. The engineer needs to configure Cloud Router to exchange routes with the on-premises router. Which two configuration steps are required? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable the BGP session on the Cloud Router and configure the peer IP address and ASN.
Option A is correct because Cloud Router uses BGP to dynamically exchange routes with the on-premises router over Dedicated Interconnect. Enabling the BGP session requires configuring the peer IP address (the on-premises router's interface IP) and the on-premises ASN, which allows the two routers to establish a BGP peering and exchange prefixes.
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.
✓
Enable the BGP session on the Cloud Router and configure the peer IP address and ASN.
Why this is correct
A BGP session is needed to exchange routes with the on-premises router.
Related concept
Read the scenario before looking for a memorised answer.
✓
Create a VLAN attachment for the Interconnect connection.
Why this is correct
A VLAN attachment is necessary to attach the Interconnect to the VPC.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a static route in Google Cloud VPC with the on-premises prefix.
Assign a primary and secondary IP range to the Cloud Router interface.
Why it's wrong here
Cloud Router interface uses a single IP address, not primary/secondary ranges.
✗
Configure the Cloud Router with the same ASN as the on-premises router.
Why it's wrong here
ASNs can be different; private ASNs are commonly used.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Cloud Router must use the same ASN as the on-premises router, but eBGP requires different ASNs, and Cloud Router does not support iBGP for Dedicated Interconnect.
Detailed technical explanation
How to think about this question
Dedicated Interconnect requires a VLAN attachment that acts as the Layer 2 link between the on-premises router and Google's edge. Cloud Router then establishes an eBGP session over this VLAN attachment, using the peer IP assigned to the on-premises interface and a unique ASN to exchange routes. The VLAN attachment must be created before the BGP session can be configured, as it provides the underlying connectivity.
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.
Configuring network services — This question tests Configuring network services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable the BGP session on the Cloud Router and configure the peer IP address and ASN. — Option A is correct because Cloud Router uses BGP to dynamically exchange routes with the on-premises router over Dedicated Interconnect. Enabling the BGP session requires configuring the peer IP address (the on-premises router's interface IP) and the on-premises ASN, which allows the two routers to establish a BGP peering and exchange prefixes.
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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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.
Question Discussion
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