JN0-106 Junos OS Fundamentals Practice Question
Which command shows the operational status of all interfaces in a brief format?
⚠ Common exam trap
Many exam-takers confuse 'show interfaces terse' with 'show interfaces brief' (which does not exist in Junos) or assume 'show configuration interfaces' shows operational status, when it only shows configuration data.
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 terse' command displays a brief, one-line summary of each interface, including its administrative status (up/down), link status, protocol status, and configured IP addresses. This is the correct command for a concise overview of all interfaces' operational state, as specified in the Junos OS documentation.
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 outputs a single-line entry per physical and logical interface, showing the administrative state (Admin) and operational state (Link) as up or down, along with the protocol family and configured IP addresses. This concise format is the go-to way to quickly assess the real-world status of all interfaces on a Junos device, making it the correct answer for this question.
- ✗
show interfaces statistics
Why it's wrong here
'show interfaces statistics' is intended to display traffic accounting information, such as input/output packet and byte counts, as well as interface error counters. Although a header may include the interface name, the command does not make the operational up/down state a primary display field, so you would not use it to determine whether interfaces are physically or administratively up.
- ✗
show interfaces detail
Why it's wrong here
'show interfaces detail' provides an exhaustive output for each interface, including MTU, MAC address, flags, encapsulation, and detailed protocol states, but it is not the brief operational status view requested. Because it includes far more information than needed and wraps to multiple pages, it is neither concise nor focused on just the operational state, which is why it is incorrect.
- ✗
show configuration interfaces
Why it's wrong here
'show configuration interfaces' presents the configured interface hierarchy from the candidate or active configuration database, not the live operational state of the device. It shows what interfaces are configured and their settings, but it cannot reflect link status or administration state changes that have occurred since the configuration was committed.
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Same concept, more angles
1 more way this is tested on JN0-106
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer needs to check the operational status of all interfaces on a Juniper device. Which command provides a summary of interface status including link state, protocol state, and error counters?
easy- ✓ A.show interfaces
- B.show configuration interfaces
- C.show interfaces terse
- D.show interface descriptions
Why A: The 'show interfaces' command provides a detailed summary of all interfaces, including administrative status, link state, protocol state, and error counters. It displays a comprehensive view of interface operational status, which meets the engineer's requirement for error counters. Option C (show interfaces terse) gives a concise summary but does not include error counters.
JA
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.