JNCIA-JUNOS Junos OS Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of junos os fundamentals. 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.
Exhibit
Refer to the exhibit.
root@router# show system syslog
user.info {
file messages;
}
authorization {
file interactive-commands;
}
root@router> show log messages | last 10
Jun 15 12:00:01 router xntpd[1234]: time reset +0.1 sec
Jun 15 12:05:00 router sshd[5678]: Accepted password for admin from 10.0.0.1 port 22
Refer to the exhibit. An administrator wants to see authentication-related logs like SSH logins. In the current configuration, which log file contains this information?
Refer to the exhibit.
root@router# show system syslog
user.info {
file messages;
}
authorization {
file interactive-commands;
}
root@router> show log messages | last 10
Jun 15 12:00:01 router xntpd[1234]: time reset +0.1 sec
Jun 15 12:05:00 router sshd[5678]: Accepted password for admin from 10.0.0.1 port 22
A
utmp
Why wrong: utmp is not a syslog file; it's a database of current logins.
B
interactive-commands
The authorization facility logs authentication events to the interactive-commands file.
C
security
Why wrong: There is no security log file configured in the exhibit.
D
messages
Why wrong: The messages file contains user.info, not authorization events.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
interactive-commands
Option B is correct because the 'interactive-commands' log file is specifically designed to capture user-executed commands, including authentication-related events such as SSH login attempts and command execution. In Junos, this log is enabled by default and records all interactive CLI commands, which includes the authentication phase of SSH sessions.
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.
✗
utmp
Why it's wrong here
utmp is not a syslog file; it's a database of current logins.
✓
interactive-commands
Why this is correct
The authorization facility logs authentication events to the interactive-commands file.
Related concept
Read the scenario before looking for a memorised answer.
✗
security
Why it's wrong here
There is no security log file configured in the exhibit.
✗
messages
Why it's wrong here
The messages file contains user.info, not authorization events.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'interactive-commands' with 'messages' or 'security' logs, assuming authentication events are always in the security log, but Junos specifically segregates CLI and authentication logs into the interactive-commands file.
Detailed technical explanation
How to think about this question
The 'interactive-commands' log is controlled by the 'system syslog' hierarchy and can be viewed with 'show log interactive-commands'. It records all CLI commands entered by users, including the initial SSH authentication sequence (e.g., user login, password acceptance). In a real-world scenario, if an administrator suspects unauthorized access, this log is the first place to check for command history and login timestamps, as it captures both successful and failed authentication attempts (depending on the configured syslog severity).
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 JNCIA-JUNOS 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.
Junos OS Fundamentals — This question tests Junos OS Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: interactive-commands — Option B is correct because the 'interactive-commands' log file is specifically designed to capture user-executed commands, including authentication-related events such as SSH login attempts and command execution. In Junos, this log is enabled by default and records all interactive CLI commands, which includes the authentication phase of SSH sessions.
What should I do if I get this JNCIA-JUNOS 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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