200-201 Security Monitoring Practice Question
A security analyst is reviewing firewall logs and notices a rule that denies traffic from source IP 10.0.0.5 to destination port 3389. What service is being blocked?
⚠ Common exam trap
Cisco often tests the association of default port numbers with common services, and the trap here is that candidates may confuse RDP (3389) with SSH (22) or SMTP (25) due to similar remote access or management functions.
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
✓
RDP
Port 3389 is the default port for Remote Desktop Protocol (RDP), which is used for remote graphical desktop access to Windows systems. The firewall rule denying traffic from 10.0.0.5 to this port blocks RDP connections, preventing that host from initiating remote desktop sessions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
RDP
Why this is correct
RDP uses port 3389.
- ✗
SNMP
Why it's wrong here
SNMP uses ports 161/162.
- ✗
SMTP
Why it's wrong here
SMTP uses port 25.
- ✗
SSH
Why it's wrong here
SSH uses port 22.
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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.