- A
VPC Network Peering
Why wrong: Peering is not used in NCC; spokes connect via NCC.
- B
NCC hub
The hub is the central routing entity in NCC.
- C
Dedicated Interconnect VLAN attachments
Why wrong: VLAN attachments are used for Dedicated Interconnect, not required for NCC hub-and-spoke.
- D
Cloud Router
Why wrong: Cloud Router is used for BGP sessions but not a core component of NCC topology definition.
- E
VPC spokes
Spokes are VPCs that attach to the hub.
Question 673 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. 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 planning to connect multiple VPCs in different projects to a common on-premises network using a hub-and-spoke topology. They want to use Network Connectivity Center (NCC). Which TWO components are required to set up this topology?
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
✓
NCC hub
NCC uses a hub (NCC hub) and spokes (VPC spokes). Spokes are VPCs that connect to the hub. The hub acts as a central point for routing.
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.
- ✗
VPC Network Peering
Why it's wrong here
Peering is not used in NCC; spokes connect via NCC.
- ✓
NCC hub
Why this is correct
The hub is the central routing entity in NCC.
Related concept
Access ports place end devices into a single VLAN.
- ✗
Dedicated Interconnect VLAN attachments
Why it's wrong here
VLAN attachments are used for Dedicated Interconnect, not required for NCC hub-and-spoke.
- ✗
Cloud Router
Why it's wrong here
Cloud Router is used for BGP sessions but not a core component of NCC topology definition.
- ✓
VPC spokes
Why this is correct
Spokes are VPCs that attach to the hub.
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.
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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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 — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: NCC hub — NCC uses a hub (NCC hub) and spokes (VPC spokes). Spokes are VPCs that connect to the hub. The hub acts as a central point for routing.
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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