- A
OS Login stores SSH keys in a Cloud KMS-managed keystore for enhanced encryption
Why wrong: OS Login doesn't use Cloud KMS for key storage — it maps SSH access to IAM roles, eliminating the need for metadata-stored SSH keys entirely.
- B
OS Login links SSH access to IAM roles — access is centrally managed and revocable via IAM without updating VM metadata
OS Login replaces metadata SSH key management with IAM-based access control. Revoking IAM role immediately revokes SSH access — no per-VM key cleanup needed.
- C
OS Login automatically generates and rotates SSH key pairs every 24 hours
Why wrong: OS Login doesn't auto-rotate SSH keys — it maps user identities to IAM, and users authenticate with their own SSH keys associated with their Google account.
- D
OS Login restricts SSH access to connections from specific IP ranges defined in Cloud Armor
Why wrong: OS Login is an identity and key management feature — it doesn't enforce IP-based access restrictions. VPC firewall rules or IAP control IP-level access.
Quick Answer
The answer is that OS Login links SSH access to IAM roles, providing centrally managed and revocable access without updating VM metadata. This is correct because OS Login replaces the default metadata-based SSH key approach, where keys are stored in instance metadata and must be manually added or removed per VM. Instead, OS Login integrates with Cloud IAM, so granting or revoking the roles/compute.osLogin role on a user or service account instantly controls SSH access to GKE nodes, eliminating metadata edits and improving auditability. On the Google Associate Cloud Engineer exam, this tests your understanding of secure access management versus legacy key injection—a common trap is assuming OS Login still requires metadata key management. Remember the mnemonic: “IAM, not metadata” for OS Login, meaning access follows IAM roles, not static keys.
Google ACE Configuring access and security Practice Question
This ACE practice question tests your understanding of configuring access and security. 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.
A team enables OS Login on their GKE node pool. What does OS Login provide for SSH access to GKE nodes compared to the default metadata-based SSH key approach?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
OS Login links SSH access to IAM roles — access is centrally managed and revocable via IAM without updating VM metadata
OS Login links SSH access to IAM roles, so access is centrally managed and revocable via IAM without updating VM metadata. This means you can grant or revoke SSH access to GKE nodes by assigning or removing IAM roles (e.g., roles/compute.osLogin) on user or service accounts, eliminating the need to manage SSH keys in instance metadata. This provides a more secure and auditable access control mechanism compared to the default metadata-based SSH key approach.
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.
- ✗
OS Login stores SSH keys in a Cloud KMS-managed keystore for enhanced encryption
Why it's wrong here
OS Login doesn't use Cloud KMS for key storage — it maps SSH access to IAM roles, eliminating the need for metadata-stored SSH keys entirely.
- ✓
OS Login links SSH access to IAM roles — access is centrally managed and revocable via IAM without updating VM metadata
- ✗
OS Login automatically generates and rotates SSH key pairs every 24 hours
Why it's wrong here
OS Login doesn't auto-rotate SSH keys — it maps user identities to IAM, and users authenticate with their own SSH keys associated with their Google account.
- ✗
OS Login restricts SSH access to connections from specific IP ranges defined in Cloud Armor
Why it's wrong here
OS Login is an identity and key management feature — it doesn't enforce IP-based access restrictions. VPC firewall rules or IAP control IP-level access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse OS Login with SSH key management in metadata, thinking it still requires manual key distribution, when in fact it delegates authentication entirely to IAM, making access fully revocable and auditable without metadata updates.
Detailed technical explanation
How to think about this question
Under the hood, OS Login uses the IAM API to verify the user's identity and then injects a temporary SSH public key into the instance's authorized_keys file via the OS Login daemon, which is valid only for the session. This approach integrates with Cloud Audit Logs to record every SSH login attempt, providing a clear audit trail. In a real-world scenario, if a contractor leaves the company, you can revoke their IAM role immediately, and their SSH access to all GKE nodes is cut off without needing to touch any VM metadata.
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
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this ACE question test?
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: OS Login links SSH access to IAM roles — access is centrally managed and revocable via IAM without updating VM metadata — OS Login links SSH access to IAM roles, so access is centrally managed and revocable via IAM without updating VM metadata. This means you can grant or revoke SSH access to GKE nodes by assigning or removing IAM roles (e.g., roles/compute.osLogin) on user or service accounts, eliminating the need to manage SSH keys in instance metadata. This provides a more secure and auditable access control mechanism compared to the default metadata-based SSH key approach.
What should I do if I get this ACE 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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Last reviewed: Jun 11, 2026
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