- 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
The correct answer is D, but note that a single physical connection cannot achieve a 99.99% SLA. Google Cloud requires at least two physical circuits for Dedicated Interconnect to provide the 99.99% SLA. The question's requirement for a single physical connection is incompatible with the stated SLA. Therefore, the only viable option that meets the SLA is D, which uses two 10 Gbps links (active/standby) and two VLAN attachments. Option A uses a single link and does not meet the SLA. Thus, the correct choice is D, acknowledging that the requirement for a single physical connection is not feasible for the desired SLA.
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
The trap is that students may think a single high-capacity link can provide 99.99% SLA, but Google Cloud's SLA for Dedicated Interconnect explicitly requires two physically diverse circuits. The desire for a single physical connection is a distractor; the correct choice must meet the SLA first.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Visual reference
What to study next
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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 — The correct answer is D, but note that a single physical connection cannot achieve a 99.99% SLA. Google Cloud requires at least two physical circuits for Dedicated Interconnect to provide the 99.99% SLA. The question's requirement for a single physical connection is incompatible with the stated SLA. Therefore, the only viable option that meets the SLA is D, which uses two 10 Gbps links (active/standby) and two VLAN attachments. Option A uses a single link and does not meet the SLA. Thus, the correct choice is D, acknowledging that the requirement for a single physical connection is not feasible for the desired SLA.
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.
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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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