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. A key principle to apply: messages. 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?
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
A
utmp
Why wrong: utmp is used for user accounting, not authentication logs.
B
interactive-commands
Why wrong: interactive-commands logs CLI commands after authentication, not authentication events themselves.
C
security
Why wrong: security logs security policy and firewall events, not default authentication logs.
D
messages
messages is the default syslog file in Junos that includes authentication events such as SSH login attempts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
messages
In Junos, authentication-related logs such as SSH login attempts are recorded by default in the 'messages' log file. This file captures syslog messages for various system events, including authentication successes and failures. The 'interactive-commands' log file only logs user-executed CLI commands after successful login, not the authentication process itself. The 'security' log is intended for firewall and security policy events, and 'utmp' is for user accounting. Therefore, option D is correct.
Key principle: messages
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 used for user accounting, not authentication logs.
✗
interactive-commands
Why it's wrong here
interactive-commands logs CLI commands after authentication, not authentication events themselves.
✗
security
Why it's wrong here
security logs security policy and firewall events, not default authentication logs.
✓
messages
Why this is correct
messages is the default syslog file in Junos that includes authentication events such as SSH login attempts.
Related concept
messages
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates may assume interactive-commands logs authentication events because it records CLI commands, but authentication occurs before command logging begins. The default location for authentication logs is the messages file.
Trap categories for this question
Command / output trap
interactive-commands logs CLI commands after authentication, not authentication events themselves.
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
messages
interactive-commands
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
messages
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. messages 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.
Review messages, then practise related JNCIA-JUNOS questions on the same topic to reinforce the concept.
Junos OS Fundamentals — This question tests Junos OS Fundamentals — messages.
What is the correct answer to this question?
The correct answer is: messages — In Junos, authentication-related logs such as SSH login attempts are recorded by default in the 'messages' log file. This file captures syslog messages for various system events, including authentication successes and failures. The 'interactive-commands' log file only logs user-executed CLI commands after successful login, not the authentication process itself. The 'security' log is intended for firewall and security policy events, and 'utmp' is for user accounting. Therefore, option D is correct.
What should I do if I get this JNCIA-JUNOS question wrong?
Review messages, then practise related JNCIA-JUNOS questions on the same topic to reinforce the concept.
What is the key concept behind this question?
messages
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