Google PCA Practice Question: Managing Implementation and Ensuring Solution and Operations Reliability
This PCA practice question tests your understanding of managing implementation and ensuring solution and operations reliability. 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.
Your company plans to connect an on-premises data center to Google Cloud with a Dedicated Interconnect. You need to ensure high availability for the connection. What is the minimum configuration required to meet a 99.99% SLA for Dedicated Interconnect?
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 Dedicated Interconnect circuits, each in a different edge availability domain, with a Cloud Router for each connection
Dedicated Interconnect requires two separate circuits (each 10 Gbps or 100 Gbps) to achieve a 99.99% SLA. A single circuit provides a 99.9% SLA, and Google Cloud recommends using two circuits in different edge availability domains. Cloud Router alone does not provide redundancy without multiple VLAN attachments and circuits.
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 Dedicated Interconnect circuits, each in a different edge availability domain, with a Cloud Router for each connection
Why this is correct
Two circuits with separate edge domains ensure 99.99% SLA.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Access ports place end devices into a single VLAN.
✗
A single Dedicated Interconnect circuit with a Cloud Router configured for BGP advertisements
Why it's wrong here
A single circuit only provides 99.9% SLA.
✗
One Dedicated Interconnect circuit and one Partner Interconnect connection as a backup
Why it's wrong here
Partner Interconnect has a different SLA (99.9%) and does not combine to achieve 99.99%.
✗
One Dedicated Interconnect circuit with two VLAN attachments on the same circuit
Why it's wrong here
VLAN attachments on the same circuit do not provide circuit-level redundancy.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
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 PCA questions on switching, trunking, and access-port configuration.
Managing Implementation and Ensuring Solution and Operations Reliability — This question tests Managing Implementation and Ensuring Solution and Operations Reliability — Access ports place end devices into a single VLAN..
What is the correct answer to this question?
The correct answer is: Two Dedicated Interconnect circuits, each in a different edge availability domain, with a Cloud Router for each connection — Dedicated Interconnect requires two separate circuits (each 10 Gbps or 100 Gbps) to achieve a 99.99% SLA. A single circuit provides a 99.9% SLA, and Google Cloud recommends using two circuits in different edge availability domains. Cloud Router alone does not provide redundancy without multiple VLAN attachments and circuits.
What should I do if I get this PCA 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 PCA questions on switching, trunking, and access-port configuration.
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?
Access ports place end devices into a single VLAN.
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