JN0-106 User Interfaces Practice Question
A network engineer needs to view the operational status of all interfaces on a Junos device, including those that are disabled. Which command should be used?
⚠ Common exam trap
The trap is that candidates may assume 'show interfaces' only shows enabled interfaces, but in fact it shows all interfaces including disabled. The common mistake is to choose 'show interfaces' thinking 'show interfaces terse' might omit some interfaces. However, 'show interfaces terse' also includes disabled interfaces and is more efficient for a quick overview of operational status.
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
The 'show interfaces' command displays detailed information for all interfaces, including those that are administratively disabled. However, 'show interfaces terse' provides a concise, one-line-per-interface summary that is more efficient for quickly viewing the operational status of all interfaces, including disabled ones. For the JNCIA exam, 'show interfaces terse' is the recommended command for this purpose because it offers a clear and compact overview of interface status across the device.
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
Why it's wrong here
The 'show interfaces' command displays detailed information for all interfaces, including those that are administratively disabled. It does not omit disabled interfaces. However, for a quick overview of operational status, 'show interfaces terse' is more efficient.
- ✗
show configuration interfaces
Why it's wrong here
The 'show configuration interfaces' command reads from the candidate or committed configuration database, displaying static stanza definitions such as unit numbers, IP addresses, and encapsulation types. It never queries the kernel's interface state, so it cannot reveal link up/down, admin status, or line protocol errors. Therefore, it is not used for viewing operational status at all.
- ✓
show interfaces terse
Why this is correct
Correct — 'show interfaces terse' displays a single-line-per-interface summary with columns for Interface, Admin, Link, Proto, and Local address, covering both physical and logical interfaces. It explicitly shows administratively disabled interfaces with an 'admin-down' flag, while also indicating the actual operational link state ('up' or 'down'). This makes it the most efficient command for quickly surveying the operational status of all interfaces on a Junos device.
- ✗
monitor interface traffic
Why it's wrong here
The 'monitor interface traffic' command is a real-time monitoring tool that continuously refreshes packet and byte counters for selected interfaces until you press Ctrl-C. It focuses on live throughput and error rate trends rather than the deterministic operational state (admin up/down, physical link presence) that you need for a quick status check. Because it requires interruption and does not provide a persistent snapshot, it is not the appropriate command for viewing overall interface operational status.
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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.