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.
A company has two on-premises data centers connected to Google Cloud via two Dedicated Interconnect connections (each 10 Gbps) from different providers. They want to achieve the highest availability for connectivity. Which configuration should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure two VLAN attachments on each Interconnect with separate BGP sessions
For highest availability, use two separate VLAN attachments on each Interconnect connection, with BGP sessions on each. This provides redundancy at multiple levels. Using a single VLAN attachment or single Interconnect reduces availability. Cloud Router with active/passive is less optimal than active/active.
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.
✓
Configure two VLAN attachments on each Interconnect with separate BGP sessions
Why this is correct
This provides redundancy at both the connection and VLAN level, maximizing availability.
Related concept
Access ports place end devices into a single VLAN.
✗
Configure one VLAN attachment per Interconnect and use BGP with active/passive
Why it's wrong here
Active/passive does not fully utilize both connections; active/active is better for high availability.
✗
Use a single VLAN attachment and rely on the second Interconnect as a backup
Why it's wrong here
A single VLAN attachment is a single point of failure.
✗
Configure each Interconnect with a single VLAN attachment and use Cloud Router with active/active BGP
Why it's wrong here
Active/active BGP is good, but a single VLAN attachment per Interconnect is still a single point of failure for that Interconnect.
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: Configure two VLAN attachments on each Interconnect with separate BGP sessions — For highest availability, use two separate VLAN attachments on each Interconnect connection, with BGP sessions on each. This provides redundancy at multiple levels. Using a single VLAN attachment or single Interconnect reduces availability. Cloud Router with active/passive is less optimal than active/active.
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.
What is the key concept behind this question?
Access ports place end devices into a single VLAN.
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Question Discussion
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