Quick Answer
The answer is to insert the rescue media and boot from it, then reinstall the image. This is the recommended method because when a Junos OS image is corrupted, the router’s internal storage is compromised and cannot load the operating system reliably; booting from external rescue media bypasses that faulty storage entirely, providing a clean, isolated environment to safely reinstall a valid Junos image. On the JNCIA-Junos exam, this scenario tests your understanding of the boot sequence and recovery procedures, often appearing as a trap where candidates might try to interrupt the boot process with the spacebar or attempt a password recovery instead. The key distinction is that a corrupted image requires hardware-level isolation, not software-level intervention. A simple memory tip: when the image is sick, boot from the stick.
This JNCIA-JUNOS practice question tests your understanding of operational monitoring and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
After a software upgrade, a router fails to boot with the new image. The engineer suspects the image is corrupted. What is the recommended method to recover?
Insert the rescue media and boot from it, then reinstall the image
Standard recovery procedure.
Delete the current configuration and reboot
Why wrong: Does not address corrupt image.
Reboot the router multiple times
Why wrong: Does not fix corruption.
Use the request system software add command with the force option
Why wrong: Requires system to be operational.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Insert the rescue media and boot from it, then reinstall the image
When a Junos OS image is corrupted and the router fails to boot, the recommended recovery method is to boot from rescue media (such as a USB flash drive or a pre-configured rescue partition) and then reinstall the correct image. This bypasses the corrupted software on the internal storage and provides a clean environment for recovery, ensuring the router can be restored to a functional state.
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.
Insert the rescue media and boot from it, then reinstall the image
Why this is correct
Standard recovery procedure.
Related concept
Read the scenario before looking for a memorised answer.
Delete the current configuration and reboot
Why it's wrong here
Does not address corrupt image.
Reboot the router multiple times
Why it's wrong here
Does not fix corruption.
Use the request system software add command with the force option
Why it's wrong here
Requires system to be operational.
Common exam traps
The trap here is that candidates may think the 'request system software add' command with the 'force' option can recover a corrupted image while the router is still booting, but this command requires a running Junos OS, which is unavailable when the image is corrupted.
Detailed technical explanation
Junos stores the active software image in the /boot directory on the internal flash (e.g., /dev/da0s1a). If the image is corrupted, the boot loader (U-Boot) cannot load the kernel, resulting in a boot loop or failure. Rescue media typically contains a minimal Junos installation that allows access to the shell, from which you can use 'request system software add' to install a valid image from a remote server or local file. In real-world scenarios, this is critical for remote sites where physical access is limited, and a pre-configured rescue partition on the router itself can automate recovery.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operational Monitoring and Maintenance — study guide chapter
Learn the concepts, then practise the questions
Operational Monitoring and Maintenance practice questions
Targeted practice on this topic area only
All JNCIA-JUNOS questions
514 questions across all exam domains
Juniper Networks Certified Associate Junos JNCIA-Junos study guide
Full concept coverage aligned to exam objectives
JNCIA-JUNOS practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise JNCIA-JUNOS questions linked to User Interfaces.
Practise JNCIA-JUNOS questions linked to Junos Configuration Basics.
Practise JNCIA-JUNOS questions linked to Operational Monitoring and Maintenance.
Practise JNCIA-JUNOS questions linked to Routing Fundamentals.
Practise JNCIA-JUNOS questions linked to Networking Fundamentals.
Practise JNCIA-JUNOS questions linked to Junos OS Fundamentals.
Practise JNCIA-JUNOS questions linked to JNCIA-JUNOS fundamentals.
Practise JNCIA-JUNOS questions linked to JNCIA-JUNOS scenario.
Practise JNCIA-JUNOS questions linked to JNCIA-JUNOS troubleshooting.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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: Insert the rescue media and boot from it, then reinstall the image — When a Junos OS image is corrupted and the router fails to boot, the recommended recovery method is to boot from rescue media (such as a USB flash drive or a pre-configured rescue partition) and then reinstall the correct image. This bypasses the corrupted software on the internal storage and provides a clean environment for recovery, ensuring the router can be restored to a functional state.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.