Quick Answer
The answer is reboot the device, as this is the final and mandatory step to activate the newly added Junos OS image. The upgrade process follows a deliberate sequence: first, you use the `request system software add` command to stage the image, which performs integrity checks and prepares the system; second, you validate the new image with `request system software validate` to confirm it is compatible and uncorrupted; and third, you issue `request system reboot` to load the validated image into active memory. On the JNCIA-Junos exam, this question tests your understanding of the complete upgrade lifecycle, often trapping candidates who think validation alone completes the process or who confuse the `add` command with immediate activation. A reliable memory tip is “Add, Validate, Reboot” — think of it as staging a play, checking the script, then raising the curtain.
This JNCIA-JUNOS practice question tests your understanding of junos os fundamentals. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 steps are typically part of a Junos OS upgrade process?
Remove the previous image.
Why wrong: E is optional and not typically part of the upgrade process.
Add the image using the request system software add command.
B is required.
Commit the configuration.
Why wrong: D is not part of OS upgrade.
Validate the new image.
A is a typical step.
Reboot the device.
C is required to load new image.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Add the image using the request system software add command.
The `request system software add` command is the correct method to initiate a Junos OS upgrade because it stages the new image on the device, performing integrity checks and preparing the system for the next boot. This command is the standard Junos CLI operation for adding a software package, making option B a core step in the upgrade process.
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.
Remove the previous image.
Why it's wrong here
E is optional and not typically part of the upgrade process.
Add the image using the request system software add command.
Why this is correct
B is required.
Related concept
Read the scenario before looking for a memorised answer.
Commit the configuration.
Why it's wrong here
D is not part of OS upgrade.
Validate the new image.
Why this is correct
A is a typical step.
Related concept
Read the scenario before looking for a memorised answer.
Reboot the device.
Why this is correct
C is required to load new image.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates mistakenly think you must delete the old image (option A) or commit the configuration (option C) as part of the upgrade, but Junos handles image management automatically and the commit is unrelated to the software installation process.
Detailed technical explanation
During a Junos OS upgrade, the `request system software add` command downloads or copies the image, validates its checksum, and installs it to an alternate boot partition (e.g., junos-install or junos-vmhost-install). The device then uses the `request system reboot` command to boot into the new image, and validation with `show system software` or `show version` confirms the upgrade succeeded. In production, you often use `request system software add validate` to check the image before committing to the reboot.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Junos OS Fundamentals — This question tests Junos OS Fundamentals — Read the scenario before looking for a memorised answer..
The correct answer is: Add the image using the request system software add command. — The `request system software add` command is the correct method to initiate a Junos OS upgrade because it stages the new image on the device, performing integrity checks and preparing the system for the next boot. This command is the standard Junos CLI operation for adding a software package, making option B a core step in the upgrade process.
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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