Quick Answer
The answer is VPC Flow Logs, as they are the correct tool to investigate unexpected outbound connections from Compute Engine instances. VPC Flow Logs capture metadata about network traffic to and from instances, including source and destination IP addresses, ports, and protocols, enabling you to trace which specific instances are communicating with suspicious IPs and analyze traffic patterns. On the Google Professional Cloud Security Engineer exam, this question tests your understanding of network visibility tools versus security controls like Firewall Rules or Cloud NAT; a common trap is confusing Flow Logs (for observation) with VPC firewall rules (for blocking). Remember the mnemonic: “Flow Logs follow the flow, firewalls filter the foe”—if you need to investigate, not block, always choose VPC Flow Logs.
This PCSE practice question tests your understanding of configuring network 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 company notices that some Compute Engine instances are making unexpected outbound connections to suspicious IP addresses. They want to investigate the traffic patterns and identify the source of these connections. Which tool should they use?
Cloud Armor
Why wrong: Cloud Armor protects HTTP(S) load balancers, not general outbound traffic.
Cloud IAM
Why wrong: IAM manages permissions, not network traffic logging.
VPC Flow Logs
VPC Flow Logs record metadata about IP traffic to and from VMs.
Firewall Rules Insights
Why wrong: Firewall Rules Insights provide information about firewall rule hit counts, not detailed traffic flows.
Answer choices
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
VPC Flow Logs capture metadata about network traffic to and from Compute Engine instances, including source/destination IPs, ports, and protocols. By analyzing these logs, the company can identify the specific instances making unexpected outbound connections to suspicious IP addresses, enabling investigation of traffic patterns.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Cloud Armor
Why it's wrong here
Cloud Armor protects HTTP(S) load balancers, not general outbound traffic.
Cloud IAM
Why it's wrong here
IAM manages permissions, not network traffic logging.
VPC Flow Logs
Why this is correct
VPC Flow Logs record metadata about IP traffic to and from VMs.
Related concept
Read the scenario before looking for a memorised answer.
Firewall Rules Insights
Why it's wrong here
Firewall Rules Insights provide information about firewall rule hit counts, not detailed traffic flows.
Common exam traps
Google Cloud often tests the distinction between tools that log actual traffic (VPC Flow Logs) versus tools that enforce security policies (Cloud Armor) or manage rules (Firewall Rules Insights), leading candidates to confuse 'investigating traffic patterns' with 'blocking traffic' or 'optimizing rules'.
Detailed technical explanation
VPC Flow Logs use the sFlow-like sampling mechanism to capture packet metadata (not payload) at the vNIC level, with a default sampling rate of 1 in 10 packets for most instance types. Logs are exported to Cloud Logging and can be analyzed with BigQuery or custom dashboards to detect anomalies like beaconing to known malicious IPs, often using threat intelligence feeds for enrichment.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Configuring network security — This question tests Configuring network security — Read the scenario before looking for a memorised answer..
The correct answer is: VPC Flow Logs — VPC Flow Logs capture metadata about network traffic to and from Compute Engine instances, including source/destination IPs, ports, and protocols. By analyzing these logs, the company can identify the specific instances making unexpected outbound connections to suspicious IP addresses, enabling investigation of traffic patterns.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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.
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