The answer is Private Service Connect, as it provides the most secure method for GKE to Cloud SQL private connectivity without proxy. This approach establishes a direct, private connection between your GKE cluster and Cloud SQL instance using an internal IP address, completely bypassing the public internet and eliminating the need for the Cloud SQL Auth Proxy. On the Google Professional Cloud Developer exam, this scenario tests your understanding of secure networking patterns within Google Cloud, often appearing as a trap where less secure options like IP whitelisting or public read replicas seem simpler but introduce vulnerabilities. The key exam insight is that Private Service Connect leverages VPC-native service controls, ensuring traffic never traverses the public internet while maintaining granular access policies. Remember the mnemonic "PSC for Private, Secure, Clean" — Private Service Connect keeps your database traffic private, secure, and clean of proxy overhead.
PCD Integrating Google Cloud services Practice Question
This PCD practice question tests your understanding of integrating google cloud services. 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.
An application running on GKE needs to access a Cloud SQL instance. The team wants to avoid using Cloud SQL Auth Proxy to reduce complexity. What is the most secure alternative?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use Private Service Connect to connect privately.
Option A is correct because Private Service Connect provides private, secure connectivity without the need for a proxy. Option B is wrong because whitelisting node IPs is insecure due to shared IPs. Option C is wrong because read replicas with public IP are less secure. Option D is wrong because allowing all VPC traffic is too permissive.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Whitelist the GKE node external IPs in Cloud SQL authorized networks.
Why it's wrong here
Node IPs are shared among pods, reducing security.
✗
Use a Cloud SQL read replica with a public IP.
Why it's wrong here
Public IP is less secure than private connectivity.
✓
Use Private Service Connect to connect privately.
Why this is correct
Private Service Connect offers secure private connectivity.
Related concept
Static NAT maps one inside address to one outside address.
✗
Configure Cloud SQL to allow all traffic from the VPC.
Why it's wrong here
Allowing all VPC traffic is overly permissive.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCD NAT questions on configuration and troubleshooting.
Integrating Google Cloud services — This question tests Integrating Google Cloud services — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use Private Service Connect to connect privately. — Option A is correct because Private Service Connect provides private, secure connectivity without the need for a proxy. Option B is wrong because whitelisting node IPs is insecure due to shared IPs. Option C is wrong because read replicas with public IP are less secure. Option D is wrong because allowing all VPC traffic is too permissive.
What should I do if I get this PCD question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCD NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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