- A
tcp.port == 443
Why wrong: This is a display filter, not a capture filter.
- B
dst port 443
Why wrong: Missing protocol; capture filter requires protocol keyword.
- C
port 443
Why wrong: In capture filters, you need to specify protocol like 'tcp' or 'udp'.
- D
tcp port 443
This is a valid capture filter syntax for port 443.
Question 512 of 1,000
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. 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 security analyst needs to filter packets in Wireshark to capture only traffic on port 443. Which filter should be used?
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
✓
tcp port 443
Option D is correct because Wireshark uses a display filter syntax where 'tcp.port' is the proper field name for TCP port filtering, and the filter 'tcp.port == 443' captures only TCP traffic on port 443 (HTTPS). This syntax is specific to Wireshark's display filter language, which differs from capture filter syntax.
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.
- ✗
tcp.port == 443
Why it's wrong here
This is a display filter, not a capture filter.
- ✗
dst port 443
Why it's wrong here
Missing protocol; capture filter requires protocol keyword.
- ✗
port 443
- ✓
tcp port 443
Why this is correct
This is a valid capture filter syntax for port 443.
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 Wireshark display filters and capture filters, trapping candidates who confuse the two syntaxes (e.g., using BPF-style 'port 443' in the display filter bar).
Trap categories for this question
Keyword trap
Missing protocol; capture filter requires protocol keyword.
Detailed technical explanation
How to think about this question
Wireshark display filters use a structured field-based syntax (e.g., 'tcp.port', 'ip.src') that allows precise filtering on protocol fields, while capture filters use a simpler BPF (Berkeley Packet Filter) syntax. A common real-world scenario is filtering HTTPS traffic for troubleshooting; using 'tcp.port == 443' ensures only TCP packets with source or destination port 443 are shown, excluding UDP or other protocols that might also use port 443.
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: tcp port 443 — Option D is correct because Wireshark uses a display filter syntax where 'tcp.port' is the proper field name for TCP port filtering, and the filter 'tcp.port == 443' captures only TCP traffic on port 443 (HTTPS). This syntax is specific to Wireshark's display filter language, which differs from capture filter syntax.
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.
About these practice questions
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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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