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ACE Practice Question: Your security team wants to prevent any user or…
This ACE practice question tests your understanding of your security team wants to prevent any user or…. 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.
Your security team wants to prevent any user or service account from creating firewall rules that allow ingress from `0.0.0.0/0` (the internet) to any VM in your organization. Which approach enforces this without requiring per-project IAM changes?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Grant IAM deny policies that prevent the `compute.firewalls.create` permission across the organization.
Removing the ability to create any firewall rule is too restrictive — it prevents legitimate firewall management, not just the specific 0.0.0.0/0 pattern.
B
Distractor review
Set the `compute.skipDefaultNetworkCreation` org policy constraint across the organization.
This prevents the default network from being created in new projects but does not restrict custom firewall rule creation or 0.0.0.0/0 rules.
C
Distractor review
Use Security Command Center to detect and alert when 0.0.0.0/0 firewall rules are created.
SCC detects and alerts on violations but doesn't prevent them. The question asks for prevention.
D
Best answer
Apply a hierarchical firewall policy at the organization level with a deny rule for ingress from 0.0.0.0/0, set to take precedence over project rules.
Hierarchical firewall policies at the org level can deny specific traffic patterns before project-level rules are evaluated. A deny rule for 0.0.0.0/0 ingress blocks this traffic organization-wide regardless of project-level firewall rules.
Common exam trap
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.
Technical deep dive
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.
Related practice questions
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
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Question 3
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Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Apply a hierarchical firewall policy at the organization level with a deny rule for ingress from 0.0.0.0/0, set to take precedence over project rules. — Organization Policy Constraints enforce rules at scale across all projects. The `compute.restrictCloudNATUsage` constraint or more specifically using a custom org policy (in Preview) or alternatively restricting via Firewall Policies at the org level is the approach. For firewall rules specifically, hierarchical firewall policies can be set at the org or folder level with a `deny` rule for 0.0.0.0/0 that takes precedence over project-level firewall rules. This is enforced by the network control plane, not IAM.
What should I do if I get this ACE 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 ACE NAT questions on configuration and troubleshooting.
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