The answer is to export Admin Activity audit logs to a Pub/Sub topic via a sink, then use a Cloud Function that subscribes to the topic to filter and post to Slack. This is correct because Admin Activity audit logs capture all login events, and a Logging sink to Pub/Sub provides the real-time streaming necessary for immediate alerting, while the Cloud Function acts as a lightweight, event-driven processor to check the source IP against the corporate CIDR range and trigger the Slack webhook. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of log-based alerting pipelines versus monitoring-based approaches—a common trap is choosing Cloud Monitoring, which cannot natively parse audit log fields for IP filtering. Remember the pipeline: logs flow to sink, sink to Pub/Sub, Pub/Sub triggers function, function filters and posts. A useful memory tip is "Sink, Stream, Slack"—the three S's of real-time security alerting.
PCSE Practice Question: Managing operations in a cloud solution environment
This PCSE practice question tests your understanding of managing operations in 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 company wants to monitor for suspicious login attempts across all their Google Cloud projects. They want to send a real-time Slack notification when a login fails from an IP address outside their corporate CIDR range. What is the most efficient way to achieve this?
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 Pub/Sub topic via a sink, and use a Cloud Function that subscribes to the topic to filter and post to Slack.
Option A is correct because Admin Activity audit logs capture login events, and a Cloud Logging sink to Pub/Sub enables real-time streaming to a Cloud Function that posts to Slack. Option B is incorrect because Cloud Monitoring does not directly analyze audit logs. Option C is incorrect because Cloud Scheduler would not provide real-time response. Option D is incorrect because Cloud Audit Logs alone cannot send Slack notifications.
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 Cloud Monitoring alert policy that checks for failed logins in logs and sends a notification to Slack via webhook.
Why it's wrong here
Cloud Monitoring alert policies can monitor logs metric but not with custom filtering for external IPs easily.
✗
Use Cloud Scheduler to run a batch job every hour that queries logs and sends a summary to Slack.
Why it's wrong here
This is not real-time.
✓
Export Admin Activity audit logs to a Pub/Sub topic via a sink, and use a Cloud Function that subscribes to the topic to filter and post to Slack.
Why this is correct
This provides real-time, scalable, and customizable notification.
Enable Cloud Audit Logs and configure a log router to forward logs directly to Slack.
Why it's wrong here
Log Router cannot send directly to Slack without a custom endpoint.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
Managing operations in a cloud solution environment — This question tests Managing operations in a cloud solution environment — 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 Pub/Sub topic via a sink, and use a Cloud Function that subscribes to the topic to filter and post to Slack. — Option A is correct because Admin Activity audit logs capture login events, and a Cloud Logging sink to Pub/Sub enables real-time streaming to a Cloud Function that posts to Slack. Option B is incorrect because Cloud Monitoring does not directly analyze audit logs. Option C is incorrect because Cloud Scheduler would not provide real-time response. Option D is incorrect because Cloud Audit Logs alone cannot send Slack notifications.
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.
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