- A
Cloud Armor security policies with logging enabled
Why wrong: Cloud Armor logs policy evaluations for HTTP requests at the load balancer — it doesn't capture raw TCP flow metadata for all VM traffic.
- B
VPC Flow Logs enabled on the subnet
VPC Flow Logs record sampled flow metadata (source/destination IPs, ports, protocol, bytes) for all traffic in the subnet — sent to Cloud Logging for analysis or export.
- C
Cloud Packet Mirroring — captures all traffic for deep packet inspection
Why wrong: Packet Mirroring captures full packets (including payload) for deep inspection — it's more powerful but also more resource-intensive and costly than Flow Logs for metadata-only analysis.
- D
Firewall Rules Logging on each firewall rule
Why wrong: Firewall Rules Logging records which firewall rule allowed or denied each connection — it doesn't capture full flow metadata like bytes transferred or flow duration.
Quick Answer
The answer is VPC Flow Logs enabled on the subnet, because this feature captures exactly the metadata your security team needs—source IP, destination IP, port, protocol, and bytes transferred—for all TCP, UDP, and ICMP flows entering and leaving VM instances, without inspecting packet payloads. This makes it the correct tool for network monitoring and security analysis at the flow level, as opposed to Cloud Packet Mirroring, which copies full packet payloads for deep inspection. On the Google Associate Cloud Engineer exam, this distinction is a common trap: many candidates confuse metadata collection with packet-level analysis, so remember that VPC Flow Logs give you the “who, what, and how much” of traffic, while Packet Mirroring gives you the “what was said.” A quick memory tip: think of VPC Flow Logs as a phone bill (showing call metadata) and Packet Mirroring as a recording of the actual conversation.
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 network security team wants to capture metadata about all TCP flows entering and leaving VMs in a specific subnet — source IP, destination IP, port, and bytes transferred — for security analysis. Which GCP feature collects this data?
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
VPC Flow Logs enabled on the subnet
VPC Flow Logs capture metadata (source/destination IP, port, protocol, bytes transferred) for all TCP (and UDP/ICMP) flows entering and leaving VM instances in a subnet. This feature is specifically designed for network monitoring and security analysis, recording flow-level logs without inspecting packet payloads. Enabling VPC Flow Logs on the subnet directly meets the requirement to collect the specified metadata for all TCP flows.
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.
- ✗
Cloud Armor security policies with logging enabled
Why it's wrong here
Cloud Armor logs policy evaluations for HTTP requests at the load balancer — it doesn't capture raw TCP flow metadata for all VM traffic.
- ✓
VPC Flow Logs enabled on the subnet
Why this is correct
VPC Flow Logs record sampled flow metadata (source/destination IPs, ports, protocol, bytes) for all traffic in the subnet — sent to Cloud Logging for analysis or export.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cloud Packet Mirroring — captures all traffic for deep packet inspection
Why it's wrong here
Packet Mirroring captures full packets (including payload) for deep inspection — it's more powerful but also more resource-intensive and costly than Flow Logs for metadata-only analysis.
- ✗
Firewall Rules Logging on each firewall rule
Why it's wrong here
Firewall Rules Logging records which firewall rule allowed or denied each connection — it doesn't capture full flow metadata like bytes transferred or flow duration.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between metadata-only logging (VPC Flow Logs) and full-packet capture (Cloud Packet Mirroring), causing candidates to mistakenly choose Packet Mirroring when only flow metadata is required.
Detailed technical explanation
How to think about this question
VPC Flow Logs use sampled flow data (default sampling rate is 1 per 10 packets, configurable) and export to Cloud Logging in a structured format that includes fields like `src_ip`, `dest_ip`, `src_port`, `dest_port`, `protocol`, and `bytes_sent`/`bytes_received`. Under the hood, the feature leverages the same flow-tracking mechanism as the VPC router, capturing 5-tuple flow information for each connection. In a real-world scenario, a security team could query these logs with BigQuery to detect anomalous traffic patterns, such as a sudden spike in bytes transferred to an unknown external IP.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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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Configuring access and security — study guide chapter
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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: VPC Flow Logs enabled on the subnet — VPC Flow Logs capture metadata (source/destination IP, port, protocol, bytes transferred) for all TCP (and UDP/ICMP) flows entering and leaving VM instances in a subnet. This feature is specifically designed for network monitoring and security analysis, recording flow-level logs without inspecting packet payloads. Enabling VPC Flow Logs on the subnet directly meets the requirement to collect the specified metadata for all TCP flows.
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 30, 2026
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