The correct command sequence is configure; load merge /var/tmp/changes.txt; commit. This works because the load merge command reads the specified text file and merges its contents into the candidate configuration without overwriting any existing settings, making it ideal for applying incremental changes during a maintenance window. On the JNCIA-Junos exam, this question tests your understanding of the Junos configuration workflow—specifically the distinction between load merge and load replace, where load merge is the safe choice for adding or modifying specific stanzas without wiping out the entire running config. A common trap is confusing load merge with load override, which replaces the entire candidate configuration and could disrupt unrelated services. Remember the memory tip: “Merge adds, override wipes”—if you only need to apply a few changes from a file, always reach for load merge.
JNCIA-JUNOS Junos OS Fundamentals Practice Question
This JNCIA-JUNOS practice question tests your understanding of junos os fundamentals. 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.
During a maintenance window, an engineer needs to apply a series of configuration changes that are stored in a text file. Which command sequence should be used to load and apply the changes from the file?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "which command"
Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
Option D is correct because the engineer needs to enter configuration mode (configure) and then use the 'load merge' command to merge the contents of the text file into the candidate configuration without replacing the entire configuration. The 'commit' command then activates the changes. This is the standard Junos workflow for applying incremental changes from a file.
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 configuration rescue save
Why it's wrong here
Saves the rescue configuration, not loads changes from a file.
✗
load override /var/tmp/changes.txt; commit
Why it's wrong here
Overrides the entire configuration with the file, which may remove existing settings.
Loads the configuration changes from the file without overwriting existing configuration, then commits.
Clue confirmation
The clue word "which command" in the question point toward this answer.
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 often confuse 'load merge' with 'load override' or 'load patch', not realizing that 'load merge' is the correct command for applying incremental changes from a standard configuration text file, while 'load override' wipes the entire configuration and 'load patch' requires a specific diff format.
Detailed technical explanation
How to think about this question
The 'load merge' command reads configuration statements from a file and merges them into the candidate configuration, handling conflicts by replacing existing statements with the same hierarchy path. This is ideal for applying a set of changes during a maintenance window because it preserves the rest of the configuration. In contrast, 'load override' completely replaces the candidate configuration, which is useful for disaster recovery but risky for incremental changes.
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 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
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: configure; load merge /var/tmp/changes.txt; commit — Option D is correct because the engineer needs to enter configuration mode (configure) and then use the 'load merge' command to merge the contents of the text file into the candidate configuration without replacing the entire configuration. The 'commit' command then activates the changes. This is the standard Junos workflow for applying incremental changes from a file.
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.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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