- A
Create a log sink in each project that routes firewall-related logs to a Cloud Storage bucket and then aggregate.
Why wrong: This is more complex and less efficient than a single export to BigQuery.
- B
Enable VPC Flow Logs on all subnets.
Why wrong: VPC Flow Logs record network traffic, not firewall rule changes.
- C
Export Admin Activity audit logs to a centralized project's BigQuery dataset.
Admin Activity logs include firewall rule changes; BigQuery enables efficient querying.
- D
Use Cloud Asset Inventory with IAM policy change feed.
Why wrong: Cloud Asset Inventory can monitor asset changes, but not specifically for firewall rules.
Question 692 of 1,000
hardMultiple ChoiceObjective-mapped
Firewall Rule Changes Audit
This PCSE practice question tests your understanding of pcse exam topics. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company has a multi-project setup with a shared VPC. They want to centrally audit all firewall rule changes. What is the most efficient way?
Quick Answer
The answer is to export Admin Activity audit logs to a centralized project’s BigQuery dataset. This is the most efficient approach because Admin Activity logs capture all configuration changes to firewall rules across every project in a shared VPC, and exporting them to a single BigQuery dataset enables powerful, queryable, centralized auditing without needing to aggregate logs from multiple sources. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of audit log types and centralized logging architecture—a common trap is confusing VPC Flow Logs (which track traffic, not rule changes) or Cloud Asset Inventory (which is better for asset discovery than real-time change tracking). Remember that Admin Activity logs are enabled by default and record all “who did what and when” for firewall modifications, making them the ideal source for a firewall rule changes audit. Memory tip: think “Admin Activity for Admin Actions” to avoid mixing it up with data-plane logs.
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
✓
Export Admin Activity audit logs to a centralized project's BigQuery dataset.
Option C is correct. Admin Activity audit logs record all configuration changes, including firewall rules. By exporting these logs from all projects to a centralized BigQuery dataset, you can efficiently query and analyze all changes across the organization. Option A: Creating a log sink in each project to route firewall-related logs to Cloud Storage and then aggregate is less efficient because it requires managing multiple sinks and aggregating data manually. Also, log sinks for firewall logs may not capture all rule changes if not configured for appropriate log types. Option B: VPC Flow Logs capture metadata about network traffic, not firewall rule changes. They are useful for network analysis but not for auditing configuration changes. Option D: Cloud Asset Inventory with IAM policy change feed tracks IAM policy changes, not firewall rule changes. It is not suitable for auditing firewall rule modifications. Thus, the most efficient way is to export Admin Activity audit logs to a centralized BigQuery dataset.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a log sink in each project that routes firewall-related logs to a Cloud Storage bucket and then aggregate.
Why it's wrong here
This is more complex and less efficient than a single export to BigQuery.
- ✗
Enable VPC Flow Logs on all subnets.
Why it's wrong here
VPC Flow Logs record network traffic, not firewall rule changes.
- ✓
Export Admin Activity audit logs to a centralized project's BigQuery dataset.
- ✗
Use Cloud Asset Inventory with IAM policy change feed.
Why it's wrong here
Cloud Asset Inventory can monitor asset changes, but not specifically for firewall rules.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCSE subnetting questions on CIDR, address ranges, and subnet selection.
Related practice questions
Related PCSE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Configuring Access Within a Cloud Solution Environment practice questions
Practise PCSE questions linked to Configuring Access Within a Cloud Solution Environment.
Ensuring Data Protection practice questions
Practise PCSE questions linked to Ensuring Data Protection.
Managing Operations in a Cloud Solution Environment practice questions
Practise PCSE questions linked to Managing Operations in a Cloud Solution Environment.
Configuring Network Security practice questions
Practise PCSE questions linked to Configuring Network Security.
Supporting Compliance Requirements practice questions
Practise PCSE questions linked to Supporting Compliance Requirements.
PCSE fundamentals practice questions
Practise PCSE questions linked to PCSE fundamentals.
PCSE scenario practice questions
Practise PCSE questions linked to PCSE scenario.
PCSE troubleshooting practice questions
Practise PCSE questions linked to PCSE troubleshooting.
Practice this exam
Start a free PCSE practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this PCSE question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Export Admin Activity audit logs to a centralized project's BigQuery dataset. — Option C is correct. Admin Activity audit logs record all configuration changes, including firewall rules. By exporting these logs from all projects to a centralized BigQuery dataset, you can efficiently query and analyze all changes across the organization. Option A: Creating a log sink in each project to route firewall-related logs to Cloud Storage and then aggregate is less efficient because it requires managing multiple sinks and aggregating data manually. Also, log sinks for firewall logs may not capture all rule changes if not configured for appropriate log types. Option B: VPC Flow Logs capture metadata about network traffic, not firewall rule changes. They are useful for network analysis but not for auditing configuration changes. Option D: Cloud Asset Inventory with IAM policy change feed tracks IAM policy changes, not firewall rule changes. It is not suitable for auditing firewall rule modifications. Thus, the most efficient way is to export Admin Activity audit logs to a centralized BigQuery dataset.
What should I do if I get this PCSE question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related PCSE subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More PCSE practice questions
- Match each encryption scope to its description.
- Drag and drop the steps to set up a Private Google Access for on-premises hosts using Private Service Connect in the cor…
- A company is designing a CI/CD pipeline using Cloud Build. Security requirements mandate that the pipeline deploy only t…
- A company must implement data residency requirements that prohibit storing data outside the European Union. They are usi…
- A company wants to allow employees to access a web application running on Google Kubernetes Engine (GKE) using their cor…
- A company is deploying a multi-tier application on Google Cloud. The web tier must be accessible from the internet, whil…
Last reviewed: Jun 24, 2026
This PCSE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCSE exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.