Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. 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 needs to connect an on-premises data center to Google Cloud using Dedicated Interconnect with a 10 Gbps link. They require high availability and want to achieve 99.99% SLA. What is the minimum number of VLAN attachments and Interconnect connections needed?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Two Interconnect connections, each with one VLAN attachment.
To achieve 99.99% SLA with Dedicated Interconnect, you need two separate Interconnect connections (for physical diversity) and each connection must have at least one VLAN attachment. The SLA requires redundant paths; a single Interconnect connection, even with multiple VLAN attachments, does not provide physical diversity and thus cannot meet the 99.99% uptime target.
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.
✓
Two Interconnect connections, each with one VLAN attachment.
Why this is correct
Two connections in different edge availability domains provide 99.99% SLA.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
One Interconnect connection with two VLAN attachments.
Why it's wrong here
One connection is single point of failure; SLA is lower.
✗
Four Interconnect connections with one VLAN attachment each.
Why it's wrong here
Overkill; not minimal.
✗
Two Interconnect connections, each with two VLAN attachments.
Why it's wrong here
More than needed; additional attachments don't improve SLA beyond two connections.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse VLAN attachments with physical redundancy, thinking multiple VLAN attachments on a single Interconnect connection can achieve the 99.99% SLA, but the SLA explicitly requires two separate Interconnect connections for physical diversity.
Detailed technical explanation
How to think about this question
Dedicated Interconnect uses BGP for dynamic routing between your on-premises router and Google's edge router. Each VLAN attachment corresponds to a separate BGP session and a distinct VLAN ID (802.1Q). For 99.99% SLA, Google requires at least two physically diverse Interconnect connections (different colocation facilities or diverse fiber paths) because the SLA is calculated per connection; a single connection only offers 99.9% uptime. The VLAN attachments themselves do not contribute to the SLA calculation—they are logical constructs that must be paired with physically redundant links.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Manage implementation of cloud architecture — This question tests Manage implementation of cloud architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Two Interconnect connections, each with one VLAN attachment. — To achieve 99.99% SLA with Dedicated Interconnect, you need two separate Interconnect connections (for physical diversity) and each connection must have at least one VLAN attachment. The SLA requires redundant paths; a single Interconnect connection, even with multiple VLAN attachments, does not provide physical diversity and thus cannot meet the 99.99% uptime target.
What should I do if I get this PCA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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