- A
The 'login block-for' command specifies the duration (in seconds) that login access is blocked after a threshold of failed attempts is exceeded.
This is correct; 'login block-for <seconds>' defines the quiet period after the failure threshold is reached.
- B
The 'login delay' command sets a mandatory delay (in milliseconds) between successive login attempts on a line.
This is correct; 'login delay <milliseconds>' enforces a pause between login attempts to mitigate brute-force attacks.
- C
The 'login on-failure log' command must be configured for the 'login block-for' command to function.
Why wrong: This is false; 'login on-failure log' is optional and only enables logging of failed attempts, but it is not required for 'login block-for' to work.
- D
The 'login quiet-mode access-class' command is used to allow only specific IP addresses during the quiet period.
Why wrong: This is incorrect; the correct command is 'login quiet-mode access-class <acl>' (note 'quiet-mode' not 'quiet-mode access-class' as a standalone command). The statement is misleading; the command exists but is phrased inaccurately.
- E
The 'login block-for' command can be applied per-line to override global settings.
Why wrong: This is false; 'login block-for' is a global configuration command and cannot be applied per-line.
Quick Answer
The answer is that the 'login delay' command sets a mandatory pause between successive login attempts on a line, while the 'login block-for' command enforces a quiet period after a threshold of failed attempts is exceeded. The 'login delay' command, configured in milliseconds, directly slows brute-force attacks by forcing an attacker to wait between each guess, whereas 'login block-for' works with a watch period and a failure count to temporarily lock all login access for a specified duration in seconds. On the Cisco CCNP ENARSI 300-410 exam, this topic tests your understanding of login enhancements for device access control, often appearing in multiple-choice questions that pair these two commands as complementary brute force mitigation tools. A common trap is confusing the units: 'login delay' uses milliseconds, while 'login block-for' uses seconds. Memory tip: think of "delay" as a small, per-attempt speed bump (ms), and "block-for" as a large, time-out penalty (seconds).
300-410 Device Access Control Practice Question
This 300-410 practice question tests your understanding of device access control. 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. 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 TWO statements about configuring login enhancements for device access control on a Cisco IOS router are true? (Choose TWO.)
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
The 'login block-for' command specifies the duration (in seconds) that login access is blocked after a threshold of failed attempts is exceeded.
Option A is correct because the 'login block-for' command specifies the duration in seconds that login access is blocked after a threshold of failed attempts is exceeded. This command is part of the login enhancements feature that provides brute-force attack mitigation by enforcing a quiet period when the number of failed login attempts reaches a configured value within a specified watch period.
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.
- ✓
The 'login block-for' command specifies the duration (in seconds) that login access is blocked after a threshold of failed attempts is exceeded.
Why this is correct
This is correct; 'login block-for <seconds>' defines the quiet period after the failure threshold is reached.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
The 'login delay' command sets a mandatory delay (in milliseconds) between successive login attempts on a line.
Why this is correct
This is correct; 'login delay <milliseconds>' enforces a pause between login attempts to mitigate brute-force attacks.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'login on-failure log' command must be configured for the 'login block-for' command to function.
Why it's wrong here
This is false; 'login on-failure log' is optional and only enables logging of failed attempts, but it is not required for 'login block-for' to work.
- ✗
The 'login quiet-mode access-class' command is used to allow only specific IP addresses during the quiet period.
Why it's wrong here
This is incorrect; the correct command is 'login quiet-mode access-class <acl>' (note 'quiet-mode' not 'quiet-mode access-class' as a standalone command). The statement is misleading; the command exists but is phrased inaccurately.
- ✗
The 'login block-for' command can be applied per-line to override global settings.
Why it's wrong here
This is false; 'login block-for' is a global configuration command and cannot be applied per-line.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'login on-failure log' is a prerequisite for 'login block-for' to work, but in reality, the blocking function is independent of logging, and the logging command only adds syslog messages for failed attempts.
Trap categories for this question
Keyword trap
This is incorrect; the correct command is 'login quiet-mode access-class <acl>' (note 'quiet-mode' not 'quiet-mode access-class' as a standalone command). The statement is misleading; the command exists but is phrased inaccurately.
Command / output trap
This is incorrect; the correct command is 'login quiet-mode access-class <acl>' (note 'quiet-mode' not 'quiet-mode access-class' as a standalone command). The statement is misleading; the command exists but is phrased inaccurately.
Detailed technical explanation
How to think about this question
The login enhancements feature uses a three-parameter model: a watch period (time window), a threshold (number of failed attempts), and a block duration. The 'login block-for <seconds> attempts <count> within <seconds>' command configures these globally, and when the threshold is exceeded, the router enters quiet mode where all login attempts are dropped except those matching the 'login quiet-mode access-class' ACL. This mechanism is independent of per-line delays or logging, and it is designed to protect against dictionary attacks on VTY, AUX, and console lines.
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 practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: The 'login block-for' command specifies the duration (in seconds) that login access is blocked after a threshold of failed attempts is exceeded. — Option A is correct because the 'login block-for' command specifies the duration in seconds that login access is blocked after a threshold of failed attempts is exceeded. This command is part of the login enhancements feature that provides brute-force attack mitigation by enforcing a quiet period when the number of failed login attempts reaches a configured value within a specified watch period.
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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