The answer is to use the rollback rescue command for fast config recovery in Junos. This is the correct choice because the rescue configuration is a specially saved, known-good configuration file that remains untouched by normal commit operations, allowing an engineer to quickly restore the device to a stable state after a failed change. On the Juniper Networks Certified Associate Junos JNCIA-Junos exam, this concept tests your understanding of operational recovery workflows and the distinction between standard rollback n commands and the dedicated rescue mechanism. A common trap is confusing rollback rescue with a simple rollback 1 or rollback 0, which revert to previous committed configurations that may themselves be faulty; the rescue configuration is intentionally saved as a separate safety net. Remember the memory tip: Rescue is your recovery lifeline—save it before risky changes, and when things break, rollback rescue brings you back to safety.
JNCIA-JUNOS Junos Configuration Basics Practice Question
This JNCIA-JUNOS practice question tests your understanding of junos configuration basics. 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. 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 wants to quickly restore the device to a known good configuration after a failed change. What is the recommended approach?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the 'rollback rescue' command.
Option C is correct because the 'rollback rescue' command restores the device to the rescue configuration, which is a known good configuration saved explicitly for recovery after a failed change. The rescue configuration is stored as a separate file and is not affected by normal commit operations, making it the recommended approach for quick restoration.
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.
✗
Use the 'request system configuration rescue save' command.
Why it's wrong here
This saves the current config as rescue, not restore.
✗
Use the 'rollback 0' command.
Why it's wrong here
Rollback 0 reverts to the last committed config, which may be the failed change.
✓
Use the 'rollback rescue' command.
Why this is correct
Loads the previously saved rescue configuration.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the 'load override terminal' command.
Why it's wrong here
This loads configuration from terminal input, not a saved rescue config.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'rollback rescue' with 'rollback 0', mistakenly thinking the most recent committed configuration is always a safe fallback, but 'rollback 0' includes the failed change if it was committed, whereas 'rollback rescue' restores a deliberately saved known good state.
Detailed technical explanation
How to think about this question
The rescue configuration is stored in a separate file (rescue.conf.gz) in the /config directory and is preserved across reboots and configuration changes. When a failed change is committed, the rescue configuration remains untouched, allowing 'rollback rescue' to instantly revert to that known good state without needing to manually recall or re-enter configuration. In real-world scenarios, this is critical during maintenance windows where a misconfigured commit could cause network outages, and the rescue configuration provides a safety net that can be activated in seconds.
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 Configuration Basics — This question tests Junos Configuration Basics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use the 'rollback rescue' command. — Option C is correct because the 'rollback rescue' command restores the device to the rescue configuration, which is a known good configuration saved explicitly for recovery after a failed change. The rescue configuration is stored as a separate file and is not affected by normal commit operations, making it the recommended approach for quick restoration.
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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