- A
Users with correct credentials are repeatedly denied access, and the 'show aaa local user lockout' command shows no locked accounts.
This suggests the authentication method list may not reference 'local' or the local database is not properly configured, causing failures without lockouts.
- B
The 'debug aaa authentication' output shows 'FAIL' for local authentication attempts even though the username and password are correctly configured.
This directly indicates that local authentication is failing, likely due to a misconfiguration in the method list or the local database.
- C
Users are locked out after three failed attempts despite 'login block-for' not being configured.
This indicates that local authentication lockout is enabled (via 'aaa local authentication attempts max-fail'), which is part of AAA local configuration; if misconfigured, it can cause unexpected lockouts.
- D
The 'show aaa servers' output shows the RADIUS server status as 'DEAD'.
Why wrong: This indicates a RADIUS server issue, not a local authentication problem.
- E
The 'show line' command shows that the line is in 'ready' state but login prompts are not displayed.
Why wrong: This suggests a line configuration issue (e.g., transport input or exec), not specifically a local AAA authentication problem.
Quick Answer
The answer is that users being locked out after three failed attempts despite no 'login block-for' configuration is a key symptom of AAA local authentication misconfiguration on Cisco IOS. This occurs because the router’s local authentication process enforces a default maximum-fail threshold of three attempts when the 'aaa local authentication attempts max-fail' command is implicitly or explicitly applied, yet the absence of a lockout entry in 'show aaa local user lockout' reveals the real problem: the username or password database is mismatched, or the AAA method list is incorrectly ordered or omitted. On the CCNP ENARSI 300-410 exam, this scenario tests your ability to distinguish between a security lockout policy and a misconfigured local database—a common trap is assuming lockouts always indicate a failed-attempts policy when they actually point to a broken authentication path. Remember the memory tip: “Lockout without block-for means local config is poor”—if users are denied but no lockout appears, check the username database and method list first.
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Which THREE symptoms indicate that a Cisco IOS router is experiencing issues with device access control due to misconfigured AAA local authentication? (Choose THREE.)
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
Users with correct credentials are repeatedly denied access, and the 'show aaa local user lockout' command shows no locked accounts.
Option A is correct because when AAA local authentication is misconfigured, users with valid credentials can be repeatedly denied access without any lockout entries. The 'show aaa local user lockout' command would show locked accounts only if the 'aaa local authentication attempts max-fail' feature is enabled, but the absence of lockouts indicates the issue is not due to failed attempts but rather a misconfiguration in the local username/password database or AAA method list.
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.
- ✓
Users with correct credentials are repeatedly denied access, and the 'show aaa local user lockout' command shows no locked accounts.
Why this is correct
This suggests the authentication method list may not reference 'local' or the local database is not properly configured, causing failures without lockouts.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The 'debug aaa authentication' output shows 'FAIL' for local authentication attempts even though the username and password are correctly configured.
Why this is correct
This directly indicates that local authentication is failing, likely due to a misconfiguration in the method list or the local database.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Users are locked out after three failed attempts despite 'login block-for' not being configured.
Why this is correct
This indicates that local authentication lockout is enabled (via 'aaa local authentication attempts max-fail'), which is part of AAA local configuration; if misconfigured, it can cause unexpected lockouts.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'show aaa servers' output shows the RADIUS server status as 'DEAD'.
Why it's wrong here
This indicates a RADIUS server issue, not a local authentication problem.
- ✗
The 'show line' command shows that the line is in 'ready' state but login prompts are not displayed.
Why it's wrong here
This suggests a line configuration issue (e.g., transport input or exec), not specifically a local AAA authentication problem.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between local authentication lockout (controlled by 'aaa local authentication attempts max-fail') and login blocking (controlled by 'login block-for'), causing candidates to incorrectly associate lockout behavior with the 'login block-for' feature rather than AAA local authentication parameters.
Detailed technical explanation
How to think about this question
Under the hood, Cisco IOS AAA local authentication uses the local username database stored in the running configuration. The 'aaa new-model' command must be enabled, and the authentication method list must include 'local' (e.g., 'aaa authentication login default local'). If the method list is misconfigured (e.g., missing 'local' or pointing to a non-existent group), authentication fails even with correct credentials. The 'debug aaa authentication' output shows 'FAIL' for local attempts when the username is not found or the password hash does not match, which can occur if the username is defined but the password is encrypted with a different algorithm (e.g., type 7 vs type 8/9).
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Access Control — This question tests Device Access Control — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Users with correct credentials are repeatedly denied access, and the 'show aaa local user lockout' command shows no locked accounts. — Option A is correct because when AAA local authentication is misconfigured, users with valid credentials can be repeatedly denied access without any lockout entries. The 'show aaa local user lockout' command would show locked accounts only if the 'aaa local authentication attempts max-fail' feature is enabled, but the absence of lockouts indicates the issue is not due to failed attempts but rather a misconfiguration in the local username/password database or AAA method list.
What should I do if I get this 300-410 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: Jun 24, 2026
This 300-410 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 300-410 exam.
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