The correct choice is to administratively disable unused switch ports, as this most directly supports the goal of preventing unauthorized devices from gaining network access. By issuing the shutdown command on an unused interface, you eliminate the physical access point entirely, ensuring that even if a device is plugged into the wall jack, the switch will not forward any traffic or negotiate a link. This is a fundamental port security and network hardening technique tested on the CCNA 200-301 v2 exam, often appearing in questions that contrast simple administrative shutdowns with more complex solutions like port security or 802.1X. A common trap is confusing disabling unused ports with converting them into trunk ports, which actually increases risk by enabling VLAN hopping attacks. Remember the memory tip: “If you don’t use it, shut it down” — the simplest Layer 1 action provides the strongest Layer 2 defense.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network.. 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 company wants unauthorized devices plugged into unused wall ports to have as little chance of gaining access as possible. Which action most directly supports that goal?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Administratively disable unused switch ports.
Administratively shutting down unused switch ports most directly supports the goal because it eliminates the access point entirely. Option B, converting unused ports into trunks, would actually increase risk by potentially allowing VLAN hopping and unauthorized traffic. Option D, removing VLAN assignments from active user ports, does not address unused ports and could disrupt legitimate users by forcing them into the default VLAN. Disabling unused ports is a simple and effective hardening measure that reduces attack surface.
Key principle: Administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Administratively disable unused switch ports.
Why this is correct
This is correct because unused active ports are unnecessary exposure points.
Related concept
Administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network.
✗
Convert every unused port into a trunk.
Why it's wrong here
This is wrong because trunking unused ports increases exposure and complexity.
When this WOULD be correct
If the question asked about optimizing network performance or allowing multiple VLANs for a specific purpose, converting unused ports into a trunk could be the correct answer. For instance, if a network administrator needs to consolidate VLAN traffic for efficiency, this option would be appropriate.
✗
Enable Telnet on unused ports for monitoring.
Why it's wrong here
This is wrong because Telnet is insecure and unrelated to this hardening goal.
When this WOULD be correct
If the question asked about monitoring and managing network traffic on all ports, including unused ones, enabling Telnet could be seen as a way to track unauthorized access attempts. In such a scenario, the focus would be on visibility rather than prevention.
✗
Remove all VLAN assignments from active user ports.
Why it's wrong here
This is wrong because the question is about unused-port exposure, not breaking active production access.
When this WOULD be correct
In a scenario where the question asks how to enhance security by isolating user devices from unauthorized access, and specifically mentions VLAN management, removing VLAN assignments from active ports could be correct if it prevents unauthorized access by segmenting the network effectively.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
This is correct because unused active ports are unnecessary exposure points.
✗Convert every unused port into a trunk.Wrong answer — click to see why▾
Why this is wrong here
Converting unused ports into a trunk does not prevent unauthorized access; it actually allows multiple VLANs to be carried over a single link, potentially exposing sensitive data. This action could inadvertently grant access to unauthorized devices if they connect to these trunked ports.
★ When this WOULD be the correct answer
If the question asked about optimizing network performance or allowing multiple VLANs for a specific purpose, converting unused ports into a trunk could be the correct answer. For instance, if a network administrator needs to consolidate VLAN traffic for efficiency, this option would be appropriate.
Why candidates choose this
Candidates may choose this option because they associate trunk ports with increased network capacity and flexibility, mistakenly believing that it enhances security by managing VLANs effectively, rather than recognizing the security implications of unauthorized access.
✗Enable Telnet on unused ports for monitoring.Wrong answer — click to see why▾
Why this is wrong here
Enabling Telnet on unused ports does not prevent unauthorized access; instead, it creates a potential security vulnerability by allowing remote access to those ports. This action could expose the network to unauthorized monitoring or control.
★ When this WOULD be the correct answer
If the question asked about monitoring and managing network traffic on all ports, including unused ones, enabling Telnet could be seen as a way to track unauthorized access attempts. In such a scenario, the focus would be on visibility rather than prevention.
Why candidates choose this
Candidates may choose this option because they associate Telnet with network management and monitoring, mistakenly believing that enabling it on unused ports would provide oversight and security against unauthorized access.
✗Remove all VLAN assignments from active user ports.Wrong answer — click to see why▾
Why this is wrong here
Removing VLAN assignments from active user ports does not prevent unauthorized devices from accessing the network; it could disrupt legitimate user access instead. The goal is to secure unused ports, not impact active ones.
★ When this WOULD be the correct answer
In a scenario where the question asks how to enhance security by isolating user devices from unauthorized access, and specifically mentions VLAN management, removing VLAN assignments from active ports could be correct if it prevents unauthorized access by segmenting the network effectively.
Why candidates choose this
Candidates may choose this option thinking that removing VLAN assignments would enhance security by limiting access points, not realizing that it could inadvertently disrupt legitimate user connectivity.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Don't confuse methods that limit or monitor access with those that completely prevent it. Focus on actions that eliminate the risk entirely.
Detailed technical explanation
How to think about this question
Unused switch ports represent a significant security risk because they provide potential entry points for unauthorized devices. In Cisco networking, each switch port can be administratively enabled or disabled. When a port is administratively disabled (shutdown), it stops forwarding any traffic and does not participate in VLAN or spanning-tree operations. This effectively removes the port from the network, preventing any device connected to it from gaining access or causing network disruptions.
The best practice to secure unused ports is to administratively disable them. This action is a proactive security measure that reduces the attack surface by eliminating unnecessary active ports. Unlike relying on monitoring or VLAN segmentation alone, disabling ports ensures that no traffic can pass through, which is a fundamental step in port security. Cisco switches allow network administrators to quickly disable ports via the CLI using the "shutdown" command under the interface configuration mode.
A common exam trap is confusing port security features like port-based authentication or VLAN assignments with the fundamental step of disabling unused ports. While features like 802.1X or VLAN segmentation add layers of security, they do not replace the need to shut down unused ports. Practically, leaving unused ports enabled—even if assigned to an unused VLAN—still risks unauthorized access if VLAN hopping or misconfigurations occur. Disabling ports is the simplest and most effective baseline security control in Cisco environments.
KKey Concepts to Remember
Administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network.
Unused active switch ports create unnecessary exposure points that attackers can exploit to gain unauthorized network access.
Assigning unused ports to unused VLANs does not guarantee security because VLAN hopping or misconfigurations can allow access.
Enabling insecure protocols like Telnet on unused ports increases security risks and does not prevent unauthorized physical connections.
Cisco switches use the "shutdown" command in interface configuration mode to administratively disable ports.
Disabling unused ports reduces the attack surface by eliminating potential entry points rather than relying on monitoring or detection.
Port security features complement but do not replace the fundamental security measure of disabling unused ports.
Effective network hardening starts with eliminating unnecessary active ports to prevent casual or opportunistic unauthorized access.
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
Administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network.
Real-world example
How this comes up in practice
A help-desk technician troubleshoots why a newly connected PC cannot reach shared printers on the same floor. The cable is good, the switch port is active, but the PC is in VLAN 20 and the printers are in VLAN 10. The uplink trunk only allows VLAN 10. A trunk being up does not mean every VLAN crosses it.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
Review administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network., then practise related 200-301 questions on the same topic to reinforce the concept.
Network Services and Security — This question tests Network Services and Security — Administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network..
What is the correct answer to this question?
The correct answer is: Administratively disable unused switch ports. — Administratively shutting down unused switch ports most directly supports the goal because it eliminates the access point entirely. Option B, converting unused ports into trunks, would actually increase risk by potentially allowing VLAN hopping and unauthorized traffic. Option D, removing VLAN assignments from active user ports, does not address unused ports and could disrupt legitimate users by forcing them into the default VLAN. Disabling unused ports is a simple and effective hardening measure that reduces attack surface.
What should I do if I get this 200-301 question wrong?
Review administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Administratively disabling unused switch ports prevents any Layer 2 traffic from passing through, effectively removing the port from the network.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 200-301 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 200-301 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.