The answer is to inspect packet payload or session metadata around the alert. This is correct because validating whether the destination and application protocol match the rule intent directly confirms if the IDS signature fired on legitimate traffic or a false positive. For example, if a signature is designed to detect SQL injection over HTTP but the outbound traffic is HTTPS or a different protocol, the alert is likely a false positive. On the CompTIA CySA+ CS0-003 exam, this tests your ability to perform IDS false positive validation by correlating signature criteria with actual traffic context, a common trap being analysts who rely solely on alert severity rather than verifying protocol match and payload content. Remember the mnemonic "PIP" — Protocol Inspection first, then Payload — to ensure you confirm the transport layer before diving into the data.
CS0-003 Security Operations Practice Question
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.
An IDS signature fires on outbound traffic but analysts suspect a false positive. Which validation steps are appropriate? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check whether the destination and application protocol match the rule intent
Option B is correct because validating whether the destination and application protocol match the rule intent directly confirms if the IDS signature fired on legitimate traffic or a false positive. For example, if a signature is designed to detect SQL injection over HTTP but the outbound traffic is HTTPS or a different protocol, the alert is likely a false positive. This step aligns with standard validation procedures in security operations, where analysts verify the context of the alert against the signature's defined criteria.
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.
✗
Assume all signatures are always correct
Why it's wrong here
Signatures can be noisy and need validation.
✓
Check whether the destination and application protocol match the rule intent
Why this is correct
Protocol and destination context help identify misfired signatures.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable every IDS rule from the same vendor
Why it's wrong here
Broad disabling removes unrelated coverage.
✓
Inspect packet payload or session metadata around the alert
Why this is correct
Traffic context can confirm whether the signature matched meaningful exploit content.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume all IDS alerts are accurate or overreact by disabling rules, but Cisco tests the understanding that validation requires contextual verification against the signature's intended scope, not blanket assumptions or drastic actions.
Detailed technical explanation
How to think about this question
Under the hood, IDS signatures rely on pattern matching against packet payloads or flow metadata, such as destination IP, port, and protocol fields in the TCP/IP stack. A false positive often occurs when the signature's regex or byte sequence matches benign data, like a web request containing 'OR 1=1' in a search query rather than a SQL injection attempt. In real-world scenarios, analysts use tools like tcpdump or Wireshark to capture the exact packet and compare it to the signature's trigger conditions, ensuring the alert is not a result of protocol encapsulation or encoding differences.
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 analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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: Check whether the destination and application protocol match the rule intent — Option B is correct because validating whether the destination and application protocol match the rule intent directly confirms if the IDS signature fired on legitimate traffic or a false positive. For example, if a signature is designed to detect SQL injection over HTTP but the outbound traffic is HTTPS or a different protocol, the alert is likely a false positive. This step aligns with standard validation procedures in security operations, where analysts verify the context of the alert against the signature's defined criteria.
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.
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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