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Junos Configuration Basics practice questions

Practise Juniper Networks Certified Associate Junos JNCIA-Junos Junos Configuration Basics 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: Junos Configuration Basics
Practice 10 questionsBrowse domain →

What the exam tests

What to know about Junos Configuration Basics

Junos Configuration Basics 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 Junos Configuration Basics 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

Junos Configuration Basics questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice
Review the full subnetting walkthrough →

A network engineer is configuring a new Juniper device. They intend to apply a firewall filter to an interface to only allow SSH traffic from a specific management subnet. Which configuration approach best follows Juniper best practices?

Question 2easymultiple choice
Review the full routing breakdown →

A junior engineer is asked to change the hostname of a Juniper device from 'Router-1' to 'Core-Router'. Which command sequence correctly commits the change?

Question 3hardmultiple choice
Open the full BGP breakdown →

During troubleshooting, an engineer notices that BGP sessions are flapping. They suspect that the issue might be related to the maximum number of routes allowed. To see if the BGP import policy is rejecting routes, which operational command would provide immediate insight?

Question 4mediummultiple choice
Review the full routing breakdown →

When configuring a new Juniper router, an engineer needs to ensure that configuration changes are not automatically committed after a certain time if not explicitly confirmed. Which configuration parameter controls this?

Question 5easymultiple choice
Read the full Junos Configuration Basics explanation →

A network administrator wants to view the current candidate configuration that has not yet been committed. Which command should be used?

Question 6hardmultiple choice
Read the full network assurance explanation →

An engineer is designing a network and needs to ensure that management traffic (SSH, SNMP) is always permitted, even if an interface firewall filter is applied. Which Juniper best practice should be followed?

Question 7mediummultiple choice
Read the full Junos Configuration Basics explanation →

A network engineer needs to add an additional IP address to an interface that already has a primary IP configured. Which method should be used?

Question 8easymultiple choice
Read the full Junos Configuration Basics explanation →

After making several configuration changes, an engineer wants to see what changes were made in the candidate configuration compared to the last committed configuration. Which command should be used?

Question 9mediummulti select
Read the full Junos Configuration Basics explanation →

Which TWO statements are true regarding the Junos OS commit model?

Question 10hardmulti select
Read the full Junos Configuration Basics explanation →

Which THREE are valid methods to apply a firewall filter in Junos?

Question 11easymulti select
Read the full Junos Configuration Basics explanation →

Which TWO are correct statements about the Junos configuration hierarchy?

Question 12hardmulti select
Read the full Junos Configuration Basics explanation →

Which THREE statements about the 'commit' command are correct?

Question 13mediummultiple choice
Read the full Junos Configuration Basics explanation →

Refer to the exhibit. An engineer has made changes to the candidate configuration. What will happen when the engineer issues the 'commit' command?

Exhibit

Refer to the exhibit.

[edit]
user@router# show | compare
[edit interfaces ge-0/0/0 unit 0 family inet]
+ address 10.0.0.1/24;

[edit security]
+ policies {
+     from-zone trust to-zone untrust {
+         policy permit-all {
+             match {
+                 source-address any;
+                 destination-address any;
+                 application any;
+             }
+             then {
+                 permit;
+             }
+         }
+     }
+ }
Question 14hardmultiple choice
Read the full network assurance explanation →

Refer to the exhibit. An engineer notices that SNMP traffic from source 10.1.1.1 is being rejected on interface ge-0/0/1. The engineer wants to allow SNMP from this source while still blocking other SNMP traffic from the 10.0.0.0/8 range. Which change should be made?

Exhibit

Refer to the exhibit.

user@router> show configuration interfaces ge-0/0/1
unit 0 {
    family inet {
        filter {
            input BLOCK-SNMP;
        }
        address 192.168.1.1/24;
    }
}
user@router> show configuration firewall family inet filter BLOCK-SNMP
term 1 {
    from {
        source-address {
            10.0.0.0/8;
        }
        protocol udp;
        port 161;
    }
    then {
        reject;
    }
}
term 2 {
    then accept;
}
Question 15hardmultiple choice
Open the full BGP breakdown →

A company has a Juniper MX router acting as a BGP route reflector. The router has two routing instances: 'internet' and 'management'. The 'internet' instance uses a firewall filter to block traffic to the router's loopback address from external sources. After a recent configuration change, the engineer notices that SSH access to the router's loopback IP (10.0.0.1) from the internal management network (192.168.0.0/16) is being dropped. The firewall filter for the loopback interface in the 'internet' instance is correctly configured to allow traffic from 192.168.0.0/16. The management instance has no firewall filter applied. The engineer suspects that the issue is related to how the routing instances interact with the loopback interface. Which of the following is the most likely cause and solution?

Question 16mediummultiple choice
Review the full routing breakdown →

An engineer needs to apply a configuration change that adds a new static route to the Junos device. The engineer wants to ensure the change takes effect immediately and is persistent across reboots. Which command should the engineer use?

Question 17hardmulti select
Read the full Junos Configuration Basics explanation →

Which TWO statements about configuration groups in Junos are correct? (Choose two.)

Question 18hardmultiple choice
Study the full IPv6 explanation →

Refer to the exhibit. An engineer configures interface ge-0/0/0 with both IPv4 and IPv6 addresses. The engineer notices that the interface is operationally up, but the IPv6 address is not pingable from a directly connected host. The host has an IPv6 address in the same subnet. What is the most likely cause?

Exhibit

Refer to the exhibit.

user@router> show configuration interfaces ge-0/0/0
unit 0 {
    family inet {
        address 10.0.0.1/24;
    }
    family inet6 {
        address 2001:db8::1/64;
    }
}
Question 19easymultiple choice
Review the full routing breakdown →

Your company has deployed a Juniper MX router at a branch office. The router has two upstream connections to different ISPs. The configuration currently uses a single static default route to ISP-A. The network team wants to add redundancy so that if ISP-A fails, traffic automatically uses ISP-B. The ISP-B connection is already configured on interface ge-1/0/0 with IP address 203.0.113.2/30. The next-hop IP for ISP-B is 203.0.113.1. The routing table should have a backup default route with a higher metric. Which configuration change meets the requirement?

Question 20mediummultiple choice
Read the full Junos Configuration Basics explanation →

An engineer needs to apply a configuration change to the Junos device that must survive a reboot. Which configuration mode command should be used to save the changes?

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Frequently asked questions

What does the JNCIA-JUNOS exam test about Junos Configuration Basics?
Junos Configuration Basics 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 Junos Configuration Basics questions in a focused session?
Yes — the session launcher on this page draws every question from the Junos Configuration Basics 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.