200-201 Security Monitoring Practice Question
A security analyst needs to filter packets in Wireshark to capture only traffic on port 443. Which filter should be used?
⚠ Common exam trap
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).
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
When capturing packets in Wireshark, a capture filter must be used. Capture filters use Berkeley Packet Filter (BPF) syntax. The filter 'tcp port 443' is the correct BPF syntax to capture only TCP traffic on port 443 (HTTPS). Option A uses Wireshark's display filter syntax, which is not used for capturing. Options B and C are also capture filters but B captures only destination port 443, and C captures both TCP and UDP on port 443, which is less specific.
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
Why it's wrong here
In capture filters, you need to specify protocol like 'tcp' or 'udp'.
- ✓
tcp port 443
Why this is correct
This is a valid capture filter syntax for port 443.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.