- A
Set the global routing mode
Why wrong: Routing mode affects route propagation within GCP, not BGP advertisements to on-prem.
- B
Configure custom route exchange in VPC Peering
Why wrong: Peering is unrelated to hybrid connectivity.
- C
Enable VPC Flow Logs
Why wrong: Flow logs monitor traffic but don't advertise routes.
- D
Advertise all subnets visible by the Cloud Router
This ensures on-premises knows the VPC subnets.
Question 891 of 982
PCNE Practice Question: Designing, Planning, and Prototyping a GCP Network
This PCNE practice question tests your understanding of designing, planning, and prototyping a gcp network. 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 configuring Cloud Router for BGP sessions with an on-premises router. You need to ensure that the on-premises network can reach Google Cloud services using the advertiser’s IP addresses. Which option should you configure on the Cloud Router?
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
✓
Advertise all subnets visible by the Cloud Router
Option D is correct because Cloud Router must advertise all subnets visible to it to ensure that the on-premises router learns the IP prefixes for Google Cloud services (e.g., Google APIs, GKE control planes) that are reachable via Private Google Access or Private Service Connect. By default, Cloud Router only advertises VPC subnet routes; enabling 'Advertise all subnets visible by the Cloud Router' includes custom IP ranges and service producer ranges, allowing the on-premises network to route traffic to those services using the advertiser's IP addresses.
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.
- ✗
Set the global routing mode
Why it's wrong here
Routing mode affects route propagation within GCP, not BGP advertisements to on-prem.
- ✗
Configure custom route exchange in VPC Peering
Why it's wrong here
Peering is unrelated to hybrid connectivity.
- ✗
Enable VPC Flow Logs
Why it's wrong here
Flow logs monitor traffic but don't advertise routes.
- ✓
Advertise all subnets visible by the Cloud Router
Why this is correct
This ensures on-premises knows the VPC subnets.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'advertising all subnets' with 'global routing mode' or 'VPC peering route exchange,' thinking that enabling global routing or peering will automatically propagate service IPs to on-premises, when in fact Cloud Router's BGP advertisement settings are the specific mechanism required.
Detailed technical explanation
How to think about this question
Cloud Router uses BGP to exchange routes with on-premises routers. When 'Advertise all subnets visible by the Cloud Router' is enabled, it includes not only VPC subnet routes but also custom IP ranges (e.g., from Private Service Connect or Private Google Access) that are assigned to Google-managed services. This ensures that the on-premises router receives the exact prefixes needed to route traffic to services like Cloud SQL, GKE, or Google APIs without relying on default routes or NAT. In practice, this is critical for hybrid connectivity scenarios where on-premises hosts must directly access Google Cloud services using their internal IP addresses.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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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Designing, Planning, and Prototyping a GCP Network — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Designing, Planning, and Prototyping a GCP Network — This question tests Designing, Planning, and Prototyping a GCP Network — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Advertise all subnets visible by the Cloud Router — Option D is correct because Cloud Router must advertise all subnets visible to it to ensure that the on-premises router learns the IP prefixes for Google Cloud services (e.g., Google APIs, GKE control planes) that are reachable via Private Google Access or Private Service Connect. By default, Cloud Router only advertises VPC subnet routes; enabling 'Advertise all subnets visible by the Cloud Router' includes custom IP ranges and service producer ranges, allowing the on-premises network to route traffic to those services using the advertiser's IP addresses.
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
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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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