- A
Cloud Router in global dynamic routing mode
Why wrong: Global routing mode is not required for SLA; regional is sufficient.
- B
Two VLAN attachments (one per connection)
Each VLAN attachment provides a logical path.
- C
Two BGP sessions (one per VLAN attachment)
BGP sessions establish routing redundancy.
- D
A single 10 Gbps physical connection
Why wrong: Single connection provides 99.9% SLA, not 99.99%.
- E
Two physical connections (e.g., each 10 Gbps)
Redundant physical connections are required for 99.99% SLA.
Question 517 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.
A company is designing a hybrid network using Dedicated Interconnect. They want to achieve a 99.99% SLA for availability. Which THREE configurations 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 (one per connection)
Two physical connections, two VLAN attachments, and two BGP sessions (one per attachment) are needed for 99.99% SLA.
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.
- ✗
Cloud Router in global dynamic routing mode
Why it's wrong here
Global routing mode is not required for SLA; regional is sufficient.
- ✓
Two VLAN attachments (one per connection)
- ✓
Two BGP sessions (one per VLAN attachment)
- ✗
A single 10 Gbps physical connection
Why it's wrong here
Single connection provides 99.9% SLA, not 99.99%.
- ✓
Two physical connections (e.g., each 10 Gbps)
Why this is correct
Redundant physical connections are required for 99.99% SLA.
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
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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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: Two VLAN attachments (one per connection) — Two physical connections, two VLAN attachments, and two BGP sessions (one per attachment) are needed for 99.99% SLA.
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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