The answer is that the Cloud SQL instance is not configured with an authorized network that includes the function's IP range, or the function is not using the Cloud SQL Auth proxy. This is correct because Cloud Functions run in a dynamic, serverless environment with ephemeral IPs, so they cannot rely on static IP-based authorized networks alone; the Cloud SQL Auth proxy provides a secure, identity-based tunnel that bypasses the need for IP whitelisting, but if the function attempts a direct connection via public IP, the database will reject it unless the function’s source IP range is explicitly listed. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of how Cloud SQL Auth proxy and authorized networks interact—a common trap is assuming the Cloud SQL Client role alone suffices, when in fact networking configuration is the missing piece. Remember the mnemonic: “Proxy first, IP last”—always use the Auth proxy for serverless workloads, and only fall back to authorized networks when you have a static, known IP.
PCSE Practice Question: Configuring access within a cloud solution environment
This PCSE practice question tests your understanding of configuring access within a cloud solution environment. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 developer is creating a Cloud Function that needs to access a Cloud SQL database. They have granted the function's service account the Cloud SQL Client role. However, the function still gets permission denied. What is the most likely issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The service account needs the Cloud SQL Admin role instead.
Why wrong: Cloud SQL Admin is for administrative operations.
B
The Cloud SQL instance is not configured with an authorized network that includes the function's IP range, or the function is not using the Cloud SQL Auth proxy.
Networking must allow the connection via Cloud SQL Auth proxy.
C
The function must use a VPN to connect to Cloud SQL.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The Cloud SQL instance is not configured with an authorized network that includes the function's IP range, or the function is not using the Cloud SQL Auth proxy.
Option C is correct because Cloud Functions use the Cloud SQL Auth proxy, which requires the service account to have the Cloud SQL Client role, but also the function must be in the same VPC or configured with VPC connector, otherwise it cannot reach the database IP. However, the most common reason is that the function is not using the Cloud SQL Auth proxy or the connection string is incorrect. But given the options, the most likely is that the function is trying to connect via public IP without proper authorized networks. Option A is wrong because the Cloud SQL Client role is sufficient if networking is correct. Option B is wrong because Cloud SQL Admin is unnecessary. Option D is wrong because Cloud SQL does not require VPN if using Cloud SQL Auth proxy.
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.
✗
The service account needs the Cloud SQL Admin role instead.
Why it's wrong here
Cloud SQL Admin is for administrative operations.
✓
The Cloud SQL instance is not configured with an authorized network that includes the function's IP range, or the function is not using the Cloud SQL Auth proxy.
Why this is correct
Networking must allow the connection via Cloud SQL Auth proxy.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The function must use a VPN to connect to Cloud SQL.
Why it's wrong here
Cloud SQL Auth proxy handles encrypted connections without VPN.
✗
The function needs to be in the same region as the Cloud SQL instance.
Why it's wrong here
Region is not a permission issue.
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.
What to study next
Got this wrong? Here's your next step.
Identify which PCSE 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.
Configuring access within a cloud solution environment — This question tests Configuring access within a cloud solution environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The Cloud SQL instance is not configured with an authorized network that includes the function's IP range, or the function is not using the Cloud SQL Auth proxy. — Option C is correct because Cloud Functions use the Cloud SQL Auth proxy, which requires the service account to have the Cloud SQL Client role, but also the function must be in the same VPC or configured with VPC connector, otherwise it cannot reach the database IP. However, the most common reason is that the function is not using the Cloud SQL Auth proxy or the connection string is incorrect. But given the options, the most likely is that the function is trying to connect via public IP without proper authorized networks. Option A is wrong because the Cloud SQL Client role is sufficient if networking is correct. Option B is wrong because Cloud SQL Admin is unnecessary. Option D is wrong because Cloud SQL does not require VPN if using Cloud SQL Auth proxy.
What should I do if I get this PCSE question wrong?
Identify which PCSE 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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