JNCIA-JUNOS · topic practice

User Interfaces practice questions

Practise Juniper Networks Certified Associate Junos JNCIA-Junos User Interfaces practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security
20 questionsDomain: User Interfaces

What the exam tests

What to know about User Interfaces

User Interfaces questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common User Interfaces exam traps

  • Answering from memory before reading the full scenario.
  • Missing a constraint such as cost, availability, security, scope or command context.
  • Choosing a broad answer when the question asks for the most specific fix.
  • Ignoring why the wrong options are tempting.

Practice set

User Interfaces questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice
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A network engineer needs to commit a configuration change but wants to ensure the change can be easily reverted if it causes issues. Which approach should the engineer take?

An administrator wants to view the current operational status of interface ge-0/0/1 on a Junos device. Which command displays this information?

Question 3hardmultiple choice
Review the full routing breakdown →

A junior engineer is troubleshooting a routing issue and wants to see the route table for IPv4 unicast routes. Which command will display this information?

Question 4mediummultiple choice
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An engineer needs to apply a configuration change to the device, but only if the configuration is syntactically correct. Which command should be used before committing?

An administrator wants to navigate to the configuration mode to make changes to the device. Which command should be used?

During troubleshooting, an engineer needs to view real-time logging messages on a Junos device. Which command should be used?

Question 7mediummultiple choice
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A network engineer needs to revert to the configuration that was active before the last commit. Which command accomplishes this?

An administrator wants to see the differences between the candidate configuration and the active configuration. Which command should be used?

Which TWO statements are true regarding the Junos CLI? (Choose two.)

Which THREE are valid methods to exit configuration mode in Junos? (Choose three.)

Which TWO commands can be used to view the current operational state of an interface? (Choose two.)

Question 12mediummultiple choice
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Refer to the exhibit. Based on the output, what is the operational status of interface ge-0/0/0?

Exhibit

show interfaces terse ge-0/0/0
Interface    Admin Link Proto    Local                 Remote
ge-0/0/0     up    up   inet     192.168.1.1/24
Question 13hardmultiple choice
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Refer to the exhibit. An engineer runs the command but sees no output. What is the most likely reason?

Exhibit

user@router> show configuration | display set | match "ge-0/0/0"
set interfaces ge-0/0/0 unit 0 family inet address 10.0.0.1/24
Question 14hardmultiple choice
Open the full BGP breakdown →

You are a network engineer for a service provider that recently deployed a Juniper MX router at a new Point of Presence (PoP). The router is used to aggregate customer connections and exchange routes with upstream providers via BGP. After the initial configuration, you notice that the router is not learning any routes from one of the upstream BGP peers. You have verified that the BGP session is established (state Established) and that the peer is sending routes. You suspect that the issue might be related to the firewall filter or routing policy. You want to determine if any inbound routes are being rejected and why. Which command would provide the most direct information about why routes are being rejected?

Question 15mediummultiple choice
Open the full VLAN trunking answer →

You are managing a Juniper EX4300 switch that serves as a Layer 3 access switch for a campus network. The switch has multiple VLANs configured with IRB interfaces. Users in VLAN 10 report that they cannot reach the default gateway (IRB.10) even though other VLANs are working fine. You check the configuration and see that interface irb.10 is configured with an IP address. You also verify that the VLAN is associated with the correct access ports. However, when you ping the IRB.10 address from the switch itself, it fails. You suspect that the issue might be that the IRB interface is not 'up'. Which command would you use to quickly verify the operational status of the IRB interface?

Question 16mediummultiple choice
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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?

Which TWO statements correctly describe the behavior of the 'commit confirmed' command in Junos?

Question 18easymultiple choice
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Refer to the exhibit. Which interface has an operational issue that prevents it from passing traffic?

Exhibit

Refer to the exhibit.

user@router> show interfaces terse
Interface       Admin Link Proto    Local                 Remote
ge-0/0/0        up    up   inet     10.1.1.1/24
ge-0/0/1        up    down inet     10.1.2.1/24
ge-0/0/2        down  down
lo0             up    up   inet     192.168.1.1/32
                                   inet6    fe80::1/128
Question 19mediummultiple choice
Review the full routing breakdown →

You are a network engineer for a company that has just deployed a Juniper SRX firewall in a branch office. The device has multiple interfaces: ge-0/0/0 connected to the internet, ge-0/0/1 connected to the internal LAN (192.168.1.0/24), and ge-0/0/2 connected to a DMZ (10.0.0.0/24). After initial configuration, you attempt to ping from the SRX to a server on the internet (8.8.8.8) but receive no response. You also notice that internal users can access the internet. You have verified the routing table shows a default route via ge-0/0/0. The security policies appear correct. You suspect the issue is related to interface configuration. What is the most likely cause and the correct course of action?

Which TWO statements correctly describe the behavior of the Junos CLI operational mode?

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Frequently asked questions

What does the JNCIA-JUNOS exam test about User Interfaces?
User Interfaces questions test whether you can apply the concept in context, not just recognise a definition.
How should I use these practice questions?
Select your answer before revealing the explanation. Then read why each option is right or wrong — this active recall approach builds retention far faster than re-reading notes.
Can I practise just User Interfaces questions in a focused session?
Yes — the session launcher on this page draws every question from the User Interfaces domain. Use a 10-question session first to gauge your baseline, then move to 20 or 30 once the weak spots are clear.
Where can I practise other JNCIA-JUNOS topics?
Use the topic links above to move to related areas, or go back to the JNCIA-JUNOS question bank to see all topics.
Are these real exam questions or dumps?
These are original practice questions written to test the same concepts the JNCIA-JUNOS exam covers. They are not copied from any real exam or dump site.