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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 their on-premises network to Google Cloud with a 99.99% SLA and up to 10 Gbps throughput. They have a supported partner for network connectivity. Which solution meets these requirements?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
HA VPN with two Cloud VPN gateways and four tunnels
HA VPN offers a 99.99% SLA and supports up to 10 Gbps throughput. It requires two VPN gateways and four tunnels for redundancy. Dedicated Interconnect offers 10-100 Gbps but a 99.99% SLA only with two connections. Partner Interconnect provides up to 10 Gbps but the SLA depends on the partner. The question specifies up to 10 Gbps and a partner, but HA VPN is the only one with a built-in 99.99% SLA for a single connection. However, the 'supported partner' clue suggests Partner Interconnect, but its SLA is not 99.99% guaranteed by Google. The correct answer is HA VPN because it explicitly offers 99.99% SLA and can handle up to 10 Gbps.
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.
✗
Partner Interconnect with multiple VLAN attachments
Why it's wrong here
Partner Interconnect SLA depends on the partner; Google does not guarantee 99.99% for a single partner connection.
✗
Dedicated Interconnect with a single 10 Gbps connection
Why it's wrong here
A single Dedicated Interconnect connection has an SLA of 99.9%, not 99.99%. Two connections are needed for 99.99%.
✓
HA VPN with two Cloud VPN gateways and four tunnels
Why this is correct
HA VPN provides a 99.99% SLA and supports up to 10 Gbps throughput when configured with two gateways and four tunnels.
Related concept
Access ports place end devices into a single VLAN.
✗
Classic VPN with a single tunnel
Why it's wrong here
Classic VPN does not offer a 99.99% SLA and is limited to lower throughput.
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: HA VPN with two Cloud VPN gateways and four tunnels — HA VPN offers a 99.99% SLA and supports up to 10 Gbps throughput. It requires two VPN gateways and four tunnels for redundancy. Dedicated Interconnect offers 10-100 Gbps but a 99.99% SLA only with two connections. Partner Interconnect provides up to 10 Gbps but the SLA depends on the partner. The question specifies up to 10 Gbps and a partner, but HA VPN is the only one with a built-in 99.99% SLA for a single connection. However, the 'supported partner' clue suggests Partner Interconnect, but its SLA is not 99.99% guaranteed by Google. The correct answer is HA VPN because it explicitly offers 99.99% SLA and can handle up to 10 Gbps.
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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