- A
Change the Cloud Router ASN
Why wrong: ASN does not control route filtering.
- B
Use route priority in the VPC
Why wrong: Route priority is for VPC internal routing, not BGP advertisement control.
- C
Set MED on the on-premises router
Why wrong: MED influences path selection, not filtering.
- D
Apply BGP filters on the on-premises router to limit advertised prefixes
On-premises filters can restrict which prefixes are advertised to GCP.
- E
Configure custom learned routes on the Cloud Router
Custom learned routes allow you to specify which prefixes to accept from the peer.
Question 101 of 1,000
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.
An engineer is configuring a Cloud Router for a Dedicated Interconnect VLAN attachment. They want to control which on-premises subnets are advertised to GCP. Which TWO methods can they use?
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
✓
Apply BGP filters on the on-premises router to limit advertised prefixes
Custom learned routes can be configured to filter prefixes, and BGP filters can be applied on the on-premises side.
Key principle: A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Change the Cloud Router ASN
Why it's wrong here
ASN does not control route filtering.
- ✗
Use route priority in the VPC
Why it's wrong here
Route priority is for VPC internal routing, not BGP advertisement control.
- ✗
Set MED on the on-premises router
Why it's wrong here
MED influences path selection, not filtering.
- ✓
Apply BGP filters on the on-premises router to limit advertised prefixes
Why this is correct
On-premises filters can restrict which prefixes are advertised to GCP.
Related concept
Access ports place end devices into a single VLAN.
- ✓
Configure custom learned routes on the Cloud Router
Why this is correct
Custom learned routes allow you to specify which prefixes to accept from the peer.
Related concept
Access ports place end devices into a single VLAN.
Common exam traps
Common exam trap: an active trunk can still block the VLAN you need
A trunk being up does not prove every VLAN is crossing it. Check allowed VLAN lists, native VLAN mismatch, VLAN existence and access-port assignment.
Detailed technical explanation
How to think about this question
VLAN questions usually combine access-port and trunking clues. The key is to identify whether the issue is local to one switchport, caused by the trunk, or caused by the VLAN not existing where it needs to exist.
KKey Concepts to Remember
- Access ports place end devices into a single VLAN.
- Trunk ports carry multiple VLANs between switches.
- Allowed VLAN lists decide which VLANs can cross a trunk.
- Native VLAN mismatch can create confusing symptoms.
TExam Day Tips
- Use show vlan brief to verify access VLANs.
- Use show interfaces trunk to verify trunk state and allowed VLANs.
- Do not treat every same-VLAN issue as a routing problem.
Key takeaway
A trunk being up does not mean the VLAN is allowed across it. Always verify the allowed VLAN list and whether the VLAN exists on both switches.
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.
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related PCNE questions on switching, trunking, and access-port configuration.
- →
Designing, Planning, and Prototyping a GCP Network — study guide chapter
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Designing, Planning, and Prototyping a GCP Network practice questions
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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 — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Apply BGP filters on the on-premises router to limit advertised prefixes — Custom learned routes can be configured to filter prefixes, and BGP filters can be applied on the on-premises side.
What should I do if I get this PCNE question wrong?
Review VLAN allowed lists, native VLAN mismatch detection, and how to verify VLAN membership with show vlan brief and show interfaces trunk. Then practise related PCNE questions on switching, trunking, and access-port configuration.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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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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