- A
Dedicated Interconnect with a single 10 Gbps link and single VLAN attachment
Why wrong: A single VLAN attachment does not provide redundancy; SLA requires redundant attachments.
- B
Partner Interconnect with 10 Gbps link
Why wrong: Partner Interconnect offers up to 99.99% SLA but only with two connections; single connection SLA is 99.9%.
- C
HA VPN with two external IP addresses and four tunnels
Why wrong: HA VPN also offers 99.99% SLA but uses internet, not a dedicated physical connection.
- D
Dedicated Interconnect with two 10 Gbps links (one active, one standby) and two VLAN attachments
Two physical connections (active/standby) with two VLAN attachments and BGP sessions achieve 99.99% SLA.
Question 279 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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 is planning a hybrid connectivity setup between their on-premises data center and GCP. They require a 99.99% SLA and want to use a single physical connection at 10 Gbps. Which connectivity option should they choose?
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
✓
Dedicated Interconnect with two 10 Gbps links (one active, one standby) and two VLAN attachments
Option D is correct because Dedicated Interconnect with two 10 Gbps links (one active, one standby) and two VLAN attachments meets the 99.99% SLA requirement. A single physical connection cannot achieve 99.99% SLA due to lack of redundancy; Google requires at least two physical circuits for Dedicated Interconnect to provide the 99.99% SLA. The active/standby configuration ensures failover without exceeding the single physical connection constraint mentioned in the question, as the standby link is not actively used until needed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Dedicated Interconnect with a single 10 Gbps link and single VLAN attachment
Why it's wrong here
A single VLAN attachment does not provide redundancy; SLA requires redundant attachments.
- ✗
Partner Interconnect with 10 Gbps link
Why it's wrong here
Partner Interconnect offers up to 99.99% SLA but only with two connections; single connection SLA is 99.9%.
- ✗
HA VPN with two external IP addresses and four tunnels
Why it's wrong here
HA VPN also offers 99.99% SLA but uses internet, not a dedicated physical connection.
- ✓
Dedicated Interconnect with two 10 Gbps links (one active, one standby) and two VLAN attachments
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a single physical connection can achieve 99.99% SLA if it is high-capacity, but the SLA requirement explicitly demands redundancy at the physical layer, which a single link cannot provide.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses IEEE 802.1Q VLAN tagging for traffic isolation across VLAN attachments, and the 99.99% SLA is contingent on having at least two diverse physical circuits (e.g., different metro locations or fiber paths) to protect against fiber cuts or device failures. The standby link in option D can be configured with BGP AS-path prepending to ensure it is only used during failure, while both VLAN attachments can be mapped to the same VPC for seamless failover. In real-world scenarios, organizations often pair this with Cloud Router for dynamic routing via BGP to handle automatic path selection.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Dedicated Interconnect with two 10 Gbps links (one active, one standby) and two VLAN attachments — Option D is correct because Dedicated Interconnect with two 10 Gbps links (one active, one standby) and two VLAN attachments meets the 99.99% SLA requirement. A single physical connection cannot achieve 99.99% SLA due to lack of redundancy; Google requires at least two physical circuits for Dedicated Interconnect to provide the 99.99% SLA. The active/standby configuration ensures failover without exceeding the single physical connection constraint mentioned in the question, as the standby link is not actively used until needed.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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