JN0-106 Junos OS Fundamentals Practice Question
Which THREE commands are valid in Junos operational mode? (Choose three.)
⚠ Common exam trap
The trap here is that candidates familiar with Cisco IOS may mistakenly think 'set' commands are valid in operational mode, or that 'commit and-quit' is a valid shortcut, when in Junos, operational mode only supports 'show', 'ping', 'traceroute', 'request', and other monitoring commands, while configuration changes require explicit entry into configuration mode.
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
✓
show interfaces terse
Option A, 'show interfaces terse', is valid in Junos operational mode because show commands are operational-mode commands used to display interface status and configuration summaries. Option D, 'ping 10.0.0.1 count 5', is valid in operational mode because ping is an operational-mode diagnostic command, and 'count 5' correctly limits the number of ICMP echo requests. Option E, 'request system software add /var/tmp/junos-install.tgz', is valid in operational mode because request commands are operational-mode commands used to perform system actions such as installing a Junos software package. Option B, 'set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24', is a configuration-mode command and is not valid in operational mode. Option C, 'commit and-quit', is also a configuration-mode command used to commit candidate configuration changes and exit configuration mode, so it is not valid in operational mode.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show interfaces terse
Why this is correct
The 'show interfaces terse' command is a read-only operational mode command that displays a concise summary of all interface statuses, including administrative state, link state, and protocol family addresses. It is valid in operational mode because it is a 'show' command, which is used for monitoring and troubleshooting, not for modifying the device configuration.
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set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24
Why it's wrong here
The 'set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24' command is a configuration mode command used to add an IP address to an interface in the candidate configuration. It is invalid in operational mode because 'set' commands are exclusively used to edit configuration statements, and operational mode provides no access to modify the configured state of the device.
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commit and-quit
Why it's wrong here
The 'commit and-quit' command is a configuration mode command that commits the active candidate configuration to the device and then exits configuration mode, returning to operational mode. It is not valid in operational mode because there is no configuration to commit from operational mode; the 'commit' action only makes sense after configuration changes have been staged in configuration mode.
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ping 10.0.0.1 count 5
Why this is correct
The 'ping 10.0.0.1 count 5' command is a valid operational mode command that sends exactly five ICMP echo requests to the specified destination to test network connectivity. It is an operational diagnostic tool, not a configuration alteration, so it is allowed and commonly used in operational mode for real-time troubleshooting.
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request system software add /var/tmp/junos-install.tgz
Why this is correct
The 'request system software add /var/tmp/junos-install.tgz' command is a valid operational mode command that initiates installation or upgrade of a Junos software package from a local file. It belongs to the 'request' system-software family, which performs operational tasks such as software management, system reboot, and maintenance actions, all of which are executed from operational mode, not configuration mode.
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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.