- A
tcp.dstport == 443
Why wrong: This only shows packets destined for port 443, missing source port 443 traffic.
- B
https
Why wrong: Wireshark does not have a built-in 'https' display filter; it must be filtered by port.
- C
tcp.port == 443
This display filter correctly filters packets with source or destination TCP port 443.
- D
port 443
Why wrong: This is a capture filter syntax, not a display filter.
Question 9 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 is analyzing a PCAP file in Wireshark and wants to isolate all HTTPS traffic. Which display filter should the analyst use?
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 C is correct because the display filter `tcp.port == 443` in Wireshark captures all TCP traffic where either the source or destination port is 443, which is the default port for HTTPS. HTTPS traffic is HTTP over TLS/SSL, encapsulated in TCP, so filtering on port 443 effectively isolates all HTTPS sessions. This filter is symmetric, meaning it includes both client-to-server and server-to-client packets, ensuring complete visibility of the HTTPS conversation.
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.dstport == 443
Why it's wrong here
This only shows packets destined for port 443, missing source port 443 traffic.
- ✗
https
Why it's wrong here
Wireshark does not have a built-in 'https' display filter; it must be filtered by port.
- ✓
tcp.port == 443
Why this is correct
This display filter correctly filters packets with source or destination TCP port 443.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
port 443
Why it's wrong here
This is a capture filter syntax, not a display filter.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between capture filters and display filters, and the trap here is that candidates confuse the simpler capture filter syntax (`port 443`) with the required display filter syntax (`tcp.port == 443`), leading them to choose Option D.
Trap categories for this question
Command / output trap
This only shows packets destined for port 443, missing source port 443 traffic.
Detailed technical explanation
How to think about this question
HTTPS uses TLS/SSL over TCP, and while Wireshark can decrypt HTTPS if provided with the private key or session keys, the default behavior is to show the encrypted payload. The display filter `tcp.port == 443` works because it matches any TCP segment with port 443 in either the source or destination field, leveraging Wireshark's `tcp.port` field which is a composite of `tcp.srcport` and `tcp.dstport`. In real-world analysis, analysts often combine this filter with `tls` or `ssl` to further inspect TLS handshake details, but for simply isolating HTTPS traffic, the port-based filter is the standard approach.
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 C is correct because the display filter `tcp.port == 443` in Wireshark captures all TCP traffic where either the source or destination port is 443, which is the default port for HTTPS. HTTPS traffic is HTTP over TLS/SSL, encapsulated in TCP, so filtering on port 443 effectively isolates all HTTPS sessions. This filter is symmetric, meaning it includes both client-to-server and server-to-client packets, ensuring complete visibility of the HTTPS conversation.
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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