Google PCA Manage implementation of cloud architecture Practice Question
This PCA practice question tests your understanding of manage implementation of cloud architecture. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO of the following are valid methods to securely access Google Cloud APIs from a Compute Engine instance without managing service account keys?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach a custom service account to the instance using the gcloud command
The default service account and attaching a custom service account to the instance both provide access via metadata server, no key management. Using a service account key file (B) requires key management. Using Cloud KMS (D) is for encrypting keys, not accessing APIs. IAM roles (E) are permissions, not method of access.
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.
✗
Download a service account key file and store it on the instance
Why it's wrong here
Requires managing key files, which is a security risk.
✓
Attach a custom service account to the instance using the gcloud command
Why this is correct
Custom service account can be attached at creation, no keys needed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Grant the appropriate IAM roles to the instance's service account
Why it's wrong here
Roles are necessary but not a method of access; they are permissions.
✗
Use a Cloud KMS key to generate temporary credentials
Why it's wrong here
Cloud KMS is for encryption, not generating credentials.
✓
Use the default Compute Engine service account
Why this is correct
The default service account is automatically attached; access via metadata server.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Attach a custom service account to the instance using the gcloud command — The default service account and attaching a custom service account to the instance both provide access via metadata server, no key management. Using a service account key file (B) requires key management. Using Cloud KMS (D) is for encrypting keys, not accessing APIs. IAM roles (E) are permissions, not method of access.
What should I do if I get this PCA question wrong?
Identify which PCA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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