- A
Multiple VLAN attachments can be created over a single physical interconnect link.
You can create multiple VLAN attachments over one Dedicated Interconnect link.
- B
VLAN attachments support both Dedicated and Partner Interconnect.
Why wrong: VLAN attachments are specific to Dedicated Interconnect; Partner Interconnect uses VLANs differently.
- C
A VLAN attachment can span multiple geographic regions.
Why wrong: VLAN attachments are regional; each attachment is in a specific region.
- D
Each VLAN attachment connects to a single Cloud Router.
A VLAN attachment is associated with one Cloud Router for BGP peering.
- E
A single VLAN attachment can connect to multiple VPCs.
Why wrong: A VLAN attachment connects to a single VPC.
Question 722 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. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company is migrating workloads to Google Cloud and wants to use Cloud Interconnect for low-latency connectivity. They have two on-premises locations and need to connect to multiple GCP regions. Which two statements are true about using VLAN attachments with Dedicated Interconnect? (Choose TWO.)
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
✓
Multiple VLAN attachments can be created over a single physical interconnect link.
VLAN attachments are used to create logical connections over a Dedicated Interconnect link. Each VLAN attachment connects to a single VPC and region. Multiple attachments can be created over one physical link to connect multiple VPCs or regions.
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.
- ✓
Multiple VLAN attachments can be created over a single physical interconnect link.
- ✗
VLAN attachments support both Dedicated and Partner Interconnect.
Why it's wrong here
VLAN attachments are specific to Dedicated Interconnect; Partner Interconnect uses VLANs differently.
- ✗
A VLAN attachment can span multiple geographic regions.
Why it's wrong here
VLAN attachments are regional; each attachment is in a specific region.
- ✓
Each VLAN attachment connects to a single Cloud Router.
- ✗
A single VLAN attachment can connect to multiple VPCs.
Why it's wrong here
A VLAN attachment connects to a single VPC.
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.
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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: Multiple VLAN attachments can be created over a single physical interconnect link. — VLAN attachments are used to create logical connections over a Dedicated Interconnect link. Each VLAN attachment connects to a single VPC and region. Multiple attachments can be created over one physical link to connect multiple VPCs or regions.
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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