- A
RDP
RDP uses port 3389.
- B
SNMP
Why wrong: SNMP uses ports 161/162.
- C
SMTP
Why wrong: SMTP uses port 25.
- D
SSH
Why wrong: SSH uses port 22.
Question 164 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 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?
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.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Detailed technical explanation
How to think about this question
RDP operates over TCP port 3389 by default, using T.128/T.124 protocols for graphics and input redirection. In real-world scenarios, administrators often change the RDP port via the registry (HKLM\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp\PortNumber) to evade automated scans, but the default remains 3389. The firewall log entry here indicates a standard deny rule targeting the well-known RDP port.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
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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: 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.
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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