This CS0-003 practice question tests your understanding of security operations. 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 network sensor must detect exploit traffic using packet payload signatures and generate alerts without blocking traffic. Which deployment is BEST? In the root-cause analysis phase, Which finding would most directly explain the activity?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Suricata or Snort in IDS mode on a monitored network tap or SPAN port
Suricata or Snort in IDS mode on a monitored network tap or SPAN port is the correct deployment because it passively inspects packet payloads against exploit signatures without blocking traffic, generating alerts only. This matches the requirement for detection without inline blocking, as IDS mode operates out-of-band on a copy of the traffic.
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.
✗
A vulnerability scanner run once per quarter
Why it's wrong here
Quarterly scans do not provide continuous packet-level detection.
✗
Host-based file integrity monitoring only
Why it's wrong here
FIM detects file changes on hosts, not network exploit payloads.
✓
Suricata or Snort in IDS mode on a monitored network tap or SPAN port
Why this is correct
IDS mode observes traffic and alerts on signatures while avoiding inline blocking impact.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Inline IPS mode with drop rules for all signatures
Why it's wrong here
Inline blocking can be useful, but the requirement is detection without blocking.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between IDS and IPS modes, where candidates mistakenly choose an inline IPS deployment (e.g., with iptables rules) because they assume detection requires blocking, but the question explicitly requires no blocking.
Detailed technical explanation
How to think about this question
In IDS mode, Suricata or Snort uses libpcap to capture packets from a SPAN port or network tap, then applies rule-based pattern matching (e.g., PCRE or content keywords) against payloads to identify exploits like SQL injection or buffer overflows. Unlike IPS mode, which uses iptables or NFQUEUE to drop packets inline, IDS mode never modifies traffic flow, ensuring zero latency impact on the network. A real-world scenario is detecting a Heartbleed exploit in TLS handshake payloads without disrupting encrypted sessions.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Suricata or Snort in IDS mode on a monitored network tap or SPAN port — Suricata or Snort in IDS mode on a monitored network tap or SPAN port is the correct deployment because it passively inspects packet payloads against exploit signatures without blocking traffic, generating alerts only. This matches the requirement for detection without inline blocking, as IDS mode operates out-of-band on a copy of the traffic.
What should I do if I get this CS0-003 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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