200-201 Network Intrusion Analysis Practice Question
During a SYN scan, an attacker sends a SYN packet to a closed port on a target. What response does the target typically send back?
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
✓
RST
In a SYN scan, a closed port responds with a RST packet to reject the connection attempt.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
ICMP Port Unreachable
Why it's wrong here
That is for UDP scans.
- ✓
RST
Why this is correct
Closed ports respond with RST.
- ✗
ACK
Why it's wrong here
ACK is not a response to SYN alone.
- ✗
SYN-ACK
Why it's wrong here
SYN-ACK indicates an open port.
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JA
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.