The answer is the `request system software add` and `request system software delete` commands. These are the correct choices because they are the dedicated operational mode commands in Junos OS for software lifecycle management: `request system software add` installs a new software package, while `request system software delete` removes an existing one, directly handling the task to install and remove software packages on a Junos device. On the JNCIA-Junos exam, this topic tests your understanding of basic system maintenance and software upgrade procedures, often appearing in multiple-choice questions that require you to distinguish these from unrelated commands like `file copy` or `show system software`. A common trap is confusing `request system software delete` with `request system software add` when the question asks about removal. For a memory tip, think of the word “add” as bringing a package into the system and “delete” as taking it out—just like adding or removing an app on your phone, but with a command-line twist.
JNCIA-JUNOS Junos OS Fundamentals Practice Question
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 TWO commands are used to install and remove software packages on a Junos device?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
request system software delete
The `request system software add` command is used to install a new software package on a Junos device, while `request system software delete` is used to remove an installed software package. These are the two primary operational mode commands for software lifecycle management in Junos OS.
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.
✓
request system software delete
Why this is correct
This command removes an installed software package.
Related concept
Read the scenario before looking for a memorised answer.
✗
request system software rollback
Why it's wrong here
This reverts to a previous software partition, not install or delete.
✗
show system software
Why it's wrong here
This displays installed software, but does not install or delete.
✗
request system reboot
Why it's wrong here
This reboots the device but does not manage software packages.
✓
request system software add
Why this is correct
This command is used to install a software package.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse `request system software rollback` with a removal command, but it actually reverts to a previous version without deleting the current package from the system.
Detailed technical explanation
How to think about this question
Junos OS uses a separate /altroot partition for the backup software set, allowing safe upgrades and rollbacks. The `request system software add` command validates the package, copies it to /var/tmp, and updates the active partition; `request system software delete` removes the package from the inactive partition. A subtle behavior is that after adding a package, a reboot is typically required to activate it, but the install and delete commands themselves do not trigger a reboot.
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: request system software delete — The `request system software add` command is used to install a new software package on a Junos device, while `request system software delete` is used to remove an installed software package. These are the two primary operational mode commands for software lifecycle management in Junos OS.
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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Question Discussion
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