The answer is to disable unused services or interfaces where practical, because basic device hardening practices focus on reducing the attack surface by eliminating unnecessary exposure. By turning off services like HTTP, CDP, or unused physical ports, you remove potential entry points for attackers, while preferring secure management protocols such as SSH over Telnet ensures administrative access is encrypted and authenticated. On the CCNA 200-301 v2 exam, this concept tests your understanding that security fundamentals rely on disciplined configuration choices rather than complex tools; a common trap is selecting answers that prioritize convenience, like leaving insecure protocols enabled or removing authentication. Remember that every enabled service is a potential vulnerability, so the principle is simple: if you don’t need it, disable it. A useful memory tip is “SSH in, shut down the rest” — always secure management access first, then prune unused interfaces and services.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. A key principle to apply: disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.. 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.
Which two actions are reasonable examples of basic device-hardening practice?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable unused services or interfaces where practical
Basic hardening is about reducing unnecessary exposure and making administrative access safer. In plain language, this usually means disabling services or interfaces that are not needed and preferring secure management protocols such as SSH. These choices shrink the attack surface and improve the security of routine device administration without requiring advanced security products.
The wrong answers in hardening questions often suggest convenience at the expense of security, such as leaving insecure access methods enabled or removing authentication. CCNA-level security expects you to recognize that strong fundamentals often come from disciplined configuration choices rather than from complex tools alone.
Key principle: Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Disable unused services or interfaces where practical
Why this is correct
This is correct because reducing unnecessary exposure is a basic hardening principle.
Related concept
Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.
✓
Use SSH instead of Telnet for remote management
Why this is correct
This is correct because SSH provides encrypted management access.
Related concept
Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.
✗
Allow anonymous administrative login for convenience
Why it's wrong here
This is wrong because anonymous administrative access weakens security.
When this WOULD be correct
In a hypothetical exam question focused on legacy systems or specific environments where security policies are relaxed for testing purposes, allowing anonymous administrative login could be deemed acceptable for quick access or troubleshooting without strict security protocols.
✗
Place all traffic in VLAN 1 so it is easier to remember
Why it's wrong here
This is wrong because overusing VLAN 1 is not a hardening measure.
When this WOULD be correct
In a question focused on simplifying network management for a small, non-critical environment where security is not a primary concern, placing all traffic in VLAN 1 might be considered acceptable for ease of configuration and maintenance.
✗
Remove authentication from VTY lines
Why it's wrong here
This is wrong because authentication is a key part of securing management access.
When this WOULD be correct
In a hypothetical exam scenario focused on a legacy system with strict internal access controls where the question specifies that the system is isolated from external networks, removing authentication from VTY lines might be considered acceptable for ease of access by trusted internal personnel.
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.
✓Disable unused services or interfaces where practicalCorrect answer▾
Why this is correct
This is correct because reducing unnecessary exposure is a basic hardening principle.
✗Allow anonymous administrative login for convenienceWrong answer — click to see why▾
Why this is wrong here
Allowing anonymous administrative login means no authentication is required, which completely bypasses access control. This violates the principle of least privilege and exposes the device to unauthorized configuration changes.
★ When this WOULD be the correct answer
In a hypothetical exam question focused on legacy systems or specific environments where security policies are relaxed for testing purposes, allowing anonymous administrative login could be deemed acceptable for quick access or troubleshooting without strict security protocols.
Why candidates choose this
Students might think convenience is a valid trade-off for security, especially in small or lab environments. However, in any production network, anonymous access is never acceptable.
✗Place all traffic in VLAN 1 so it is easier to rememberWrong answer — click to see why▾
Why this is wrong here
VLAN 1 is the default VLAN and is often targeted in VLAN hopping attacks. Using VLAN 1 for all traffic violates the security best practice of segregating traffic and using dedicated VLANs for management, user data, and voice.
★ When this WOULD be the correct answer
In a question focused on simplifying network management for a small, non-critical environment where security is not a primary concern, placing all traffic in VLAN 1 might be considered acceptable for ease of configuration and maintenance.
Why candidates choose this
VLAN 1 is the default and easiest to configure, so students may assume it is safe or simpler. However, security guidelines explicitly recommend not using VLAN 1 for user traffic.
✗Remove authentication from VTY linesWrong answer — click to see why▾
Why this is wrong here
Removing authentication from VTY lines means anyone can connect to the device via Telnet or SSH without a password. This is a critical security flaw that allows unauthorized remote access.
★ When this WOULD be the correct answer
In a hypothetical exam scenario focused on a legacy system with strict internal access controls where the question specifies that the system is isolated from external networks, removing authentication from VTY lines might be considered acceptable for ease of access by trusted internal personnel.
Why candidates choose this
Students might confuse 'no authentication' with 'no password required' for convenience, or they may think that physical security alone is sufficient. However, remote management must always be authenticated.
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
Avoid choosing convenience over security; protocols like Telnet and HTTP are easy but insecure for management.
Detailed technical explanation
How to think about this question
Device hardening is a fundamental security practice that involves configuring network devices to minimize vulnerabilities and reduce the attack surface. This includes disabling unused services and interfaces, which prevents unauthorized access points and limits potential exploitation vectors. Using secure management protocols like SSH instead of Telnet ensures that administrative sessions are encrypted, protecting credentials and commands from interception over the network.
In Cisco devices, disabling unused interfaces or services is a straightforward but effective way to reduce exposure. For example, shutting down unused switch ports or disabling unnecessary routing protocols prevents attackers from leveraging these entry points. Similarly, Cisco IOS supports SSH for secure remote management, which encrypts all traffic, unlike Telnet that transmits data in clear text. Choosing SSH aligns with best practices for device administration security.
A common exam trap is to confuse convenience with security, such as allowing anonymous administrative logins or removing authentication on VTY lines. These practices weaken device security and are explicitly discouraged in CCNA-level questions. Understanding that basic hardening focuses on reducing unnecessary services and enforcing secure access methods helps avoid these pitfalls and ensures compliance with Cisco’s recommended security fundamentals.
KKey Concepts to Remember
Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.
Using SSH instead of Telnet for remote device management encrypts administrative traffic, protecting credentials and commands from interception.
Cisco IOS devices allow administrators to disable unused interfaces with the 'shutdown' command to prevent unauthorized access through inactive ports.
Telnet transmits management data in clear text, making it vulnerable to eavesdropping, whereas SSH provides secure encrypted communication.
Allowing anonymous administrative login removes accountability and weakens security, which is against Cisco’s device-hardening best practices.
Placing all traffic in VLAN 1 is discouraged because VLAN 1 is the default VLAN and overusing it can expose the network to VLAN hopping attacks.
Removing authentication from VTY lines disables essential access control, making devices vulnerable to unauthorized remote management.
Basic device hardening focuses on disciplined configuration choices that reduce unnecessary exposure rather than relying solely on advanced security tools.
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
Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.
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 disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit., 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 — Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit..
What is the correct answer to this question?
The correct answer is: Disable unused services or interfaces where practical — Basic hardening is about reducing unnecessary exposure and making administrative access safer. In plain language, this usually means disabling services or interfaces that are not needed and preferring secure management protocols such as SSH. These choices shrink the attack surface and improve the security of routine device administration without requiring advanced security products.
The wrong answers in hardening questions often suggest convenience at the expense of security, such as leaving insecure access methods enabled or removing authentication. CCNA-level security expects you to recognize that strong fundamentals often come from disciplined configuration choices rather than from complex tools alone.
What should I do if I get this 200-301 question wrong?
Review disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit., then practise related 200-301 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Disabling unused services or interfaces on Cisco devices reduces the attack surface by eliminating unnecessary access points that attackers could exploit.
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