- A
Statistical filter
Why wrong: Not a standard term.
- B
Read filter
Why wrong: Not a standard term.
- C
Capture filter
Why wrong: Capture filters use -f option.
- D
Display filter
-Y applies a display filter to packets in the file.
Question 590 of 1,000
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 analyst uses 'tshark -r capture.pcap -Y "http.request.method == POST"' to display only HTTP POST requests. This is an example of a:
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
✓
Display filter
The `-Y` flag in tshark applies a display filter, which operates on packets already read from the capture file. Display filters use a syntax based on protocol fields (e.g., `http.request.method == POST`) to show or hide packets in the output without altering the underlying capture data. This is distinct from capture filters, which discard packets at the kernel level before they are stored.
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.
- ✗
Statistical filter
Why it's wrong here
Not a standard term.
- ✗
Read filter
Why it's wrong here
Not a standard term.
- ✗
Capture filter
Why it's wrong here
Capture filters use -f option.
- ✓
Display filter
Why this is correct
-Y applies a display filter to packets in the file.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between display filters (`-Y`) and capture filters (`-f`), trapping candidates who confuse the `-Y` flag with a capture filter because both can filter packets, but only capture filters discard data at the point of acquisition.
Detailed technical explanation
How to think about this question
Display filters in tshark are implemented via Wireshark's display filter engine, which parses the full packet tree and evaluates field expressions against each packet's protocol dissectors. Unlike capture filters that operate on raw bytes at the kernel level (using BPF), display filters can inspect reconstructed application-layer data, such as HTTP method strings, even if the packet is fragmented. In real-world analysis, this allows an analyst to, for example, filter for `http.request.method == POST` while still retaining all packets in memory for later correlation with other streams.
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 practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 200-201 question test?
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Display filter — The `-Y` flag in tshark applies a display filter, which operates on packets already read from the capture file. Display filters use a syntax based on protocol fields (e.g., `http.request.method == POST`) to show or hide packets in the output without altering the underlying capture data. This is distinct from capture filters, which discard packets at the kernel level before they are stored.
What should I do if I get this 200-201 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: Jul 4, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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