Quick Answer
The answer is to coordinate test windows and scope with OT owners, and to use safe-check profiles or passive discovery methods. These controls are appropriate because OT network vulnerability scan controls must prioritize stability over thoroughness; safe-check profiles disable active exploits and denial-of-service tests, while passive discovery via NetFlow or SNMP traps sends no packets to fragile devices, preventing crashes in legacy PLCs or RTUs. On the CompTIA CySA+ CS0-003 exam, this question tests your understanding of scanning constraints in segmented OT environments, where aggressive scanning can disrupt industrial operations—a common trap is choosing “full vulnerability scan” or “default credentials testing,” which violate the core principle of non-disruption. Remember the memory tip: “Safe and silent” for OT scans—safe checks and passive listening keep fragile devices running.
This CS0-003 practice question tests your understanding of vulnerability management. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 vulnerability scan of a segmented OT network must avoid disrupting fragile devices. Which controls are appropriate? (Choose two.)
Use approved safe-check profiles or passive discovery where required
Non-intrusive methods reduce disruption risk.
Scan from random external hosts
Why wrong: Uncontrolled scanning can create operational and safety risk.
Run aggressive exploit checks without approval
Why wrong: Exploit checks may disrupt fragile systems.
Coordinate test windows and scope with OT owners
OT environments require strict change and safety coordination.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use approved safe-check profiles or passive discovery where required
Option A is correct because safe-check profiles (e.g., Nessus 'safe checks' mode) disable active exploits and denial-of-service tests, while passive discovery (e.g., using NetFlow or SNMP traps) never sends packets to fragile OT devices. This prevents disruption to legacy PLCs, RTUs, or other industrial controllers that may crash under aggressive scanning.
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.
Use approved safe-check profiles or passive discovery where required
Why this is correct
Non-intrusive methods reduce disruption risk.
Related concept
Read the scenario before looking for a memorised answer.
Scan from random external hosts
Why it's wrong here
Uncontrolled scanning can create operational and safety risk.
Run aggressive exploit checks without approval
Why it's wrong here
Exploit checks may disrupt fragile systems.
Coordinate test windows and scope with OT owners
Why this is correct
OT environments require strict change and safety coordination.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the misconception that scanning from random external hosts improves stealth or coverage, but in OT segmentation, the priority is avoiding disruption—not hiding the scan source.
Detailed technical explanation
In OT environments, many devices run on legacy firmware that cannot handle rapid packet floods or malformed payloads. For example, a Siemens S7-1200 PLC may enter a stop state if it receives a crafted COTP packet during an active scan. Passive discovery leverages existing traffic (e.g., via port mirroring or PCAP analysis) to map assets without sending a single probe, while safe-check profiles in tools like OpenVAS or Qualys disable plugin families such as 'exploit' and 'dos' to ensure read-only testing.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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Vulnerability Management — study guide chapter
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FAQ
Vulnerability Management — This question tests Vulnerability Management — Read the scenario before looking for a memorised answer..
The correct answer is: Use approved safe-check profiles or passive discovery where required — Option A is correct because safe-check profiles (e.g., Nessus 'safe checks' mode) disable active exploits and denial-of-service tests, while passive discovery (e.g., using NetFlow or SNMP traps) never sends packets to fragile OT devices. This prevents disruption to legacy PLCs, RTUs, or other industrial controllers that may crash under aggressive scanning.
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 11, 2026
This CS0-003 practice question is part of Courseiva's free CompTIA 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 CS0-003 exam.
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