Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure 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.
Your company's global e-commerce platform uses a managed instance group (MIG) in us-central1 and a Cloud Load Balancer. Traffic has grown, and you want to improve availability by distributing load across multiple regions. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create MIGs in additional regions and add them as backends to the existing global load balancer.
Option C is correct because a global external HTTP(S) load balancer can have backends in multiple regions. By creating managed instance groups (MIGs) in additional regions and adding them as backends to the existing global load balancer, you distribute traffic across regions, improving availability and reducing latency for users worldwide. This approach leverages the load balancer's anycast IP and cross-region load balancing capabilities.
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.
✗
Increase the machine type of the existing instances to handle more traffic.
Why it's wrong here
Vertical scaling doesn't provide multi-region failover.
✗
Enable Cloud CDN to cache content closer to users.
Why it's wrong here
CDN reduces latency for static content but does not route dynamic traffic to multiple regions.
✓
Create MIGs in additional regions and add them as backends to the existing global load balancer.
Why this is correct
Multiple backends across regions with health checks enable the load balancer to route traffic only to healthy backends, improving availability.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change the load balancer to global and configure a single backend.
Why it's wrong here
A single backend still limits the application to one region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Cloud CDN (which caches content) with multi-region backend distribution, or think that simply making the load balancer 'global' with a single backend achieves regional redundancy, when in fact you must add backends in multiple regions to distribute load and improve availability.
Detailed technical explanation
How to think about this question
A global external HTTP(S) load balancer uses a single anycast IP address and routes traffic to the closest healthy backend based on proximity and capacity. Under the hood, it leverages Google Front Ends (GFEs) at edge locations worldwide, which terminate TLS and forward requests to backends in any configured region. In a real-world scenario, if you have backends in us-central1 and europe-west1, a user in London is routed to europe-west1, while a user in New York goes to us-central1, automatically failing over if one region becomes unhealthy.
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.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create MIGs in additional regions and add them as backends to the existing global load balancer. — Option C is correct because a global external HTTP(S) load balancer can have backends in multiple regions. By creating managed instance groups (MIGs) in additional regions and adding them as backends to the existing global load balancer, you distribute traffic across regions, improving availability and reducing latency for users worldwide. This approach leverages the load balancer's anycast IP and cross-region load balancing capabilities.
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.
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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