Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. 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 is deploying a new application on Compute Engine and wants to automate the installation of a custom agent on every newly created VM in a specific project. Which Google Cloud service 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
✓
VM Manager (OS Config) with a guest policy to install the agent.
VM Manager (OS Config) with a guest policy is the correct choice because it provides a native, agent-based configuration management service that can enforce the installation of a custom agent on all existing and newly created VMs in a project without requiring changes to instance templates or startup scripts. Guest policies are evaluated and applied at VM boot time and periodically thereafter, ensuring consistent agent deployment across the fleet.
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.
✓
VM Manager (OS Config) with a guest policy to install the agent.
Why this is correct
Os Config can enforce agent installation on all VMs in a project.
Related concept
Read the scenario before looking for a memorised answer.
✗
Instance templates with startup scripts.
Why it's wrong here
Only applies to VMs created from that specific template; not all VMs.
✗
Deployment Manager with a template that includes the agent installation.
Why it's wrong here
Deployment Manager is for initial deployment, not for VMs created outside templates.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse configuration management (OS Config guest policies) with provisioning-time automation (startup scripts in instance templates), assuming that startup scripts are sufficient for fleet-wide enforcement when they only apply at creation time and are not re-evaluated.
Detailed technical explanation
How to think about this question
OS Config guest policies use the osconfig agent running on the VM to apply desired state configurations, including package installations, software recipe executions, and patch management. The agent communicates with the OS Config API via HTTPS (port 443) and evaluates policies based on assignment filters (e.g., zones, instance names, labels). In a real-world scenario, if a security team needs to ensure a monitoring agent is present on every VM in a project, a guest policy with a software recipe can install the agent idempotently, even if the VM is created from a custom image or via managed instance groups.
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: VM Manager (OS Config) with a guest policy to install the agent. — VM Manager (OS Config) with a guest policy is the correct choice because it provides a native, agent-based configuration management service that can enforce the installation of a custom agent on all existing and newly created VMs in a project without requiring changes to instance templates or startup scripts. Guest policies are evaluated and applied at VM boot time and periodically thereafter, ensuring consistent agent deployment across the fleet.
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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