- A
Two VLAN attachments
Each link typically has its own VLAN attachment.
- B
Two Dedicated Interconnect links in different edge availability domains
Required for redundancy.
- C
One Dedicated Interconnect link with multiple VLAN attachments
Why wrong: Single link only provides 99.9% SLA.
- D
Cloud Router with BGP sessions
BGP sessions are needed for dynamic routing over each VLAN attachment.
- E
Classic VPN as a backup
Why wrong: Classic VPN is not part of Dedicated Interconnect; it's a separate solution and not required for the 99.99% SLA with Interconnect.
Question 787 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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 organization needs to design a hybrid connectivity solution with 99.99% availability for a mission-critical application. They have a co-location facility near a GCP region. Which THREE components are required to meet this SLA?
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
✓
Two VLAN attachments
For 99.99% SLA with Dedicated Interconnect, you need two links in different edge availability domains, two VLAN attachments, and BGP sessions with Cloud Router.
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.
- ✓
Two VLAN attachments
- ✓
Two Dedicated Interconnect links in different edge availability domains
Why this is correct
Required for redundancy.
Related concept
Access ports place end devices into a single VLAN.
- ✗
One Dedicated Interconnect link with multiple VLAN attachments
Why it's wrong here
Single link only provides 99.9% SLA.
- ✓
Cloud Router with BGP sessions
- ✗
Classic VPN as a backup
Why it's wrong here
Classic VPN is not part of Dedicated Interconnect; it's a separate solution and not required for the 99.99% SLA with Interconnect.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Two VLAN attachments — For 99.99% SLA with Dedicated Interconnect, you need two links in different edge availability domains, two VLAN attachments, and BGP sessions with Cloud Router.
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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