The correct choice is the one that states secure transport alone does not remove the need for source restriction and accountability controls. This is because defense in depth requires multiple overlapping layers of security; while SSH provides encryption and authentication, it does not limit which source IPs can attempt a connection, nor does it inherently log session activity for later review. On the CCNA 200-301 v2 exam, this concept tests your understanding that a single security measure—even a strong one like SSH—is insufficient without complementary controls such as source IP restriction to shrink the attack surface and detailed logging to ensure accountability and forensic evidence. A common trap is assuming SSH’s encryption alone makes other controls redundant, but the exam emphasizes that logging and ACLs serve different, essential roles. Remember the mnemonic “SAL” for SSH, ACLs, and Logs—each layer covers what the others miss.
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: sSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors.. 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 device administrator can log in securely over SSH, but the organization still insists on restricting source IP ranges and keeping detailed logs. Which statement best explains that decision?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Because secure transport alone does not remove the need for source restriction and accountability controls.
The decision reflects defense in depth. SSH encrypts the session and authenticates users, but it does not limit which source IPs can connect or provide audit trails. Source IP restriction reduces the attack surface by allowing only trusted hosts, and logging provides accountability and forensic evidence. Option B is incorrect because SSH is more secure than Telnet, not less. Option C is incorrect because logs record events but do not enforce ACLs. Option D is incorrect because source IP restriction complements authentication rather than replacing it.
Key principle: SSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Because secure transport alone does not remove the need for source restriction and accountability controls.
Why this is correct
This is correct because layered controls address different management-plane risks.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
SSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors.
✗
Because SSH is less secure than Telnet and must be compensated for.
Why it's wrong here
This is wrong because SSH is generally the more secure protocol.
When this WOULD be correct
In a different exam scenario where the question states that SSH is being used in an environment with known vulnerabilities or outdated configurations, the statement could be correct if it emphasized the need for additional security measures due to perceived weaknesses in SSH implementation.
✗
Because logs automatically enforce ACL policy.
Why it's wrong here
This is wrong because logs provide visibility rather than directly enforcing policy.
When this WOULD be correct
If the exam question stated that logging was an active mechanism for enforcing security policies, such as in a scenario where logs trigger automated responses to unauthorized access attempts, then this option could be correct.
✗
Because source IP restriction replaces the need for authentication.
Why it's wrong here
This is wrong because source filtering and identity verification solve different problems.
When this WOULD be correct
In a different scenario where the question states that a network is entirely secured through IP whitelisting, and no other authentication methods are in place, then the option could be correct. For example, if the question specifies a legacy system that only allows access based on IP addresses without user credentials, then source IP restriction could be seen as a replacement for authentication.
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.
✓Because secure transport alone does not remove the need for source restriction and accountability controls.Correct answer▾
Why this is correct
This is correct because layered controls address different management-plane risks.
✗Because SSH is less secure than Telnet and must be compensated for.Wrong answer — click to see why▾
Why this is wrong here
SSH is significantly more secure than Telnet because it encrypts all traffic, including passwords, whereas Telnet sends everything in plaintext. The statement that SSH is less secure is factually incorrect.
★ When this WOULD be the correct answer
In a different exam scenario where the question states that SSH is being used in an environment with known vulnerabilities or outdated configurations, the statement could be correct if it emphasized the need for additional security measures due to perceived weaknesses in SSH implementation.
Why candidates choose this
A student might confuse the relative security of protocols or think that because additional controls are needed, SSH must be weak. However, the need for layered security does not imply SSH is inferior to Telnet.
✗Because logs automatically enforce ACL policy.Wrong answer — click to see why▾
Why this is wrong here
Logs provide a record of events and are used for monitoring and forensic analysis, but they do not enforce ACL policy. ACLs themselves enforce policy by permitting or denying traffic; logs only capture what happened after the fact.
★ When this WOULD be the correct answer
If the exam question stated that logging was an active mechanism for enforcing security policies, such as in a scenario where logs trigger automated responses to unauthorized access attempts, then this option could be correct.
Why candidates choose this
A test-taker might think that logging can automatically trigger actions (like blocking), but standard logs are passive. Some systems can correlate logs with automated responses, but that is not inherent to logging.
✗Because source IP restriction replaces the need for authentication.Wrong answer — click to see why▾
Why this is wrong here
Source IP restriction limits which IP addresses can initiate a connection, but it does not verify the identity of the user. Authentication (e.g., via passwords or SSH keys) is still required to ensure the user is who they claim to be. These controls address different security layers.
★ When this WOULD be the correct answer
In a different scenario where the question states that a network is entirely secured through IP whitelisting, and no other authentication methods are in place, then the option could be correct. For example, if the question specifies a legacy system that only allows access based on IP addresses without user credentials, then source IP restriction could be seen as a replacement for authentication.
Why candidates choose this
A student might think that if only certain IPs are allowed, then anyone from those IPs is trusted, ignoring the need for user-level authentication. This is a common misconception about network access control.
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
A frequent exam trap is to believe that using SSH alone fully secures remote device access, leading to the mistaken idea that source IP restrictions and logging are redundant. This overlooks that SSH only encrypts the session and authenticates users but does not limit which hosts can connect or provide audit trails. Ignoring source IP filtering increases exposure to brute-force or credential compromise attacks from unauthorized IPs. Similarly, neglecting logging removes visibility into who accessed the device and when, hindering incident response. The trap is confusing transport security with comprehensive access control and accountability.
Detailed technical explanation
How to think about this question
SSH (Secure Shell) is a cryptographic network protocol that provides secure encrypted communication for remote device management. It replaces insecure protocols like Telnet by encrypting the session, protecting credentials and commands from interception. However, SSH only secures the transport layer and authenticates users; it does not inherently restrict which source IP addresses can connect to the device.
Network administrators implement source IP restrictions using ACLs (Access Control Lists) to limit management access to trusted IP ranges. This reduces the attack surface by preventing unauthorized hosts from even attempting to establish SSH sessions. Additionally, detailed logging of management access records user activity, which supports accountability and forensic investigations. These layered controls complement SSH by addressing different security domains: transport security, access control, and auditing.
A common exam trap is assuming that SSH alone is sufficient for secure device management. While SSH protects session confidentiality and integrity, it does not replace the need for source IP filtering or logging. In practice, attackers may still attempt unauthorized access from allowed IP ranges or exploit compromised credentials. Therefore, combining SSH with ACLs and logging provides a robust defense-in-depth strategy that aligns with Cisco’s best practices for securing network devices.
KKey Concepts to Remember
SSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors.
Source IP filtering via ACLs restricts which devices can initiate management sessions, reducing exposure to unauthorized access attempts.
Logging records administrative access events, enabling accountability and forensic analysis in case of security incidents.
Layered security controls work together to protect network devices by addressing different aspects of risk and attack surfaces.
Secure transport protocols like SSH protect data confidentiality and integrity during remote management sessions.
Source IP restrictions and authentication solve different security problems and must be implemented in combination for effective device protection.
Logging does not enforce access control policies but provides visibility and audit trails for network administrators.
Defense in depth is a core security principle that requires multiple complementary controls rather than relying on a single mechanism.
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
SSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors.
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.
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 sSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors., 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 — SSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors..
What is the correct answer to this question?
The correct answer is: Because secure transport alone does not remove the need for source restriction and accountability controls. — The decision reflects defense in depth. SSH encrypts the session and authenticates users, but it does not limit which source IPs can connect or provide audit trails. Source IP restriction reduces the attack surface by allowing only trusted hosts, and logging provides accountability and forensic evidence. Option B is incorrect because SSH is more secure than Telnet, not less. Option C is incorrect because logs record events but do not enforce ACLs. Option D is incorrect because source IP restriction complements authentication rather than replacing it.
What should I do if I get this 200-301 question wrong?
Review sSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors., then practise related 200-301 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
SSH provides encrypted management-plane access but does not replace the need for source IP restrictions to limit potential attack vectors.
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