Quick Answer
The answer is the `show version` operational command. This is correct because `show version` displays the currently running Junos OS release, including the software build number and edition, which is essential for verifying compatibility before any upgrade. On the JNCIA-Junos exam, this question tests your understanding of operational versus configuration commands and the specific purpose of `show version`—a common trap is confusing it with `show configuration` or `show system software`, but remember that `show version` only reports the active software, not the upgrade file itself. To check the upgrade file, you would use `file list` or `show system software`, but for the current Junos version, `show version` is the direct and required command. A helpful memory tip: think "Version is Vision"—you use `show version` to see what you have now before you change anything.
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
A network engineer is performing a software upgrade on an MX router. Before upgrading, which operational command should be used to verify the current software version and the upgrade file?
show configuration system software
Why wrong: Shows configuration, not current version.
show system upgrade
Why wrong: Not a valid command.
show system software
Why wrong: Not a valid Junos command.
show version
Shows current software version; used with 'request system software validate' for image check.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
show version
The 'show version' command displays the currently running Junos OS version, including the software build and release information. Before upgrading, you must verify the current version to ensure compatibility with the upgrade file, and the upgrade file itself is typically referenced by its filename or path, not shown by this command. To check the upgrade file, you would use 'file list' or 'show system software' to list available packages, but for the current version, 'show version' is the correct operational command.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
show configuration system software
Why it's wrong here
Shows configuration, not current version.
show system upgrade
Why it's wrong here
Not a valid command.
show system software
Why it's wrong here
Not a valid Junos command.
show version
Why this is correct
Shows current software version; used with 'request system software validate' for image check.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates confuse 'show system software' (which lists installed packages) with 'show version' (which shows the running kernel), leading them to choose C, but only 'show version' directly answers the question of the current software version.
Trap categories for this question
Command / output trap
Shows configuration, not current version.
Detailed technical explanation
The 'show version' command retrieves the active Junos kernel version from the /etc/junos-release file, while 'show system software' queries the package database for installed .tgz packages. In a real-world upgrade scenario, you must verify both the current version (via 'show version') and the upgrade file's integrity (via 'file checksum' or 'show system software' after staging) to avoid incompatibility, such as when upgrading from Junos 15.1 to 18.2 where the file system structure changed.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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Operational Monitoring and Maintenance — study guide chapter
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FAQ
Operational Monitoring and Maintenance — This question tests Operational Monitoring and Maintenance — Read the scenario before looking for a memorised answer..
The correct answer is: show version — The 'show version' command displays the currently running Junos OS version, including the software build and release information. Before upgrading, you must verify the current version to ensure compatibility with the upgrade file, and the upgrade file itself is typically referenced by its filename or path, not shown by this command. To check the upgrade file, you would use 'file list' or 'show system software' to list available packages, but for the current version, 'show version' is the correct operational command.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This JNCIA-JUNOS practice question is part of Courseiva's free Juniper Networks 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 JNCIA-JUNOS exam.
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