JN0-106 Junos Configuration Basics Practice Question
A network operations team has received a new Juniper router to replace an existing legacy router. The team needs to apply a baseline configuration that includes system settings, interfaces, and security policies. The configuration is provided as a text file containing Junos configuration hierarchy syntax (e.g., 'system { host-name... }'). The engineer connects to the console and sees the prompt 'root@%'. What is the most efficient way to apply the configuration?
⚠ Common exam trap
It's easy for candidates to confuse the shell prompt (root@%) with the configuration mode prompt (root@#) and attempt to use 'load merge' directly at the shell, which fails; they must first enter configuration mode with 'configure' or 'edit' before loading the file.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the 'load merge' command to merge the configuration file.
The engineer is at the shell prompt (root@%), not in configuration mode. The 'load merge' command is used within configuration mode to merge a configuration file (in Junos hierarchy syntax) into the candidate configuration, which is the most efficient way to apply a pre-written baseline configuration without manual typing or complex file transfers.
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 'load set' command to load a set of configuration commands.
Why it's wrong here
The 'load set' command is specifically designed to load a file containing 'set' commands (the configuration-mode command format), not a hierarchy-format configuration file. If you attempt to use 'load set' on a file written in the hierarchical braces format, the parser will misinterpret the text and likely produce errors or an incomplete configuration. Since the scenario implies a standard Junos configuration file, this command is the wrong tool for the job.
- ✗
Use FTP to transfer the file and then commit.
Why it's wrong here
Using FTP to transfer the file simply places the file into the router's filesystem; it does not touch the candidate configuration database. After the transfer, the operator must still issue a 'load' command (such as 'load merge') to read the file into the candidate configuration, and only then will 'commit' activate the changes. Committing immediately after an FTP transfer would commit the existing candidate, which has not been updated, so the configuration would not be applied.
- ✗
Enter configuration mode and manually type each command.
Why it's wrong here
Manually typing each command in configuration mode is impractical and error-prone for an entire configuration file, as it requires retyping or copying every line and increases the likelihood of human error. It also defeats the purpose of having a ready-made file that can be loaded atomically. The 'load merge' command is the proper method because it applies the file in one operation and lets you validate with 'show' or 'commit check' before committing.
- ✓
Use the 'load merge' command to merge the configuration file.
Why this is correct
The 'load merge' command is the correct choice because it reads a configuration file in the Junos hierarchy format and merges its contents into the current candidate configuration. This is the standard way to apply a full or partial configuration file without wiping out existing settings; overlapping statements are updated while untouched parts remain intact. After the merge, the candidate can be reviewed and then committed with 'commit'.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This JN0-106 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 JN0-106 exam.