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Operational Monitoring and Maintenance practice questions

Practise Juniper Networks Certified Associate Junos JNCIA-Junos Operational Monitoring and Maintenance 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: Operational Monitoring and Maintenance
Practice 10 questionsBrowse domain →

What the exam tests

What to know about Operational Monitoring and Maintenance

Operational Monitoring and Maintenance 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 Operational Monitoring and Maintenance 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

Operational Monitoring and Maintenance questions

20 questions · select your answer, then reveal the explanation

Question 1easymultiple choice
Read the full network assurance explanation →

A network engineer notices that a device is not sending SNMP traps to the NMS. Which operational command should be used to verify SNMP configuration?

Question 2mediummultiple choice
Review the full routing breakdown →

A network administrator is troubleshooting high CPU usage on a Juniper router. Which command helps identify which process is consuming the most CPU?

Question 3hardmultiple choice
Open the full BGP breakdown →

After a software upgrade, BGP sessions are not establishing. The engineer runs 'show bgp summary' and sees that all sessions are in Idle state. What is the most likely cause?

Question 4easymultiple choice
Review the full routing breakdown →

A junior engineer needs to collect a snapshot of the current system state, including routing tables, interfaces, and configuration, for a support ticket. Which command achieves this?

Question 5mediummultiple choice
Read the full Operational Monitoring and Maintenance explanation →

A network engineer wants to schedule a reboot of a Juniper device at 3:00 AM. Which command should be used?

Question 6hardmultiple choice
Review the full routing breakdown →

A router is experiencing intermittent packet loss. The engineer runs 'show interfaces ge-0/0/0 extensive' and notices a high number of input errors but no output errors. What is the most likely cause?

Question 7easymultiple choice
Read the full Operational Monitoring and Maintenance explanation →

An engineer needs to check the last time the configuration was changed. Which command provides this information?

Question 8mediummultiple choice
Open the full BGP breakdown →

A BGP session is flapping. The engineer runs 'show log messages' and sees 'BGP recv Notification' with error code 'Cease'. What does this indicate?

Question 9mediummulti select
Read the full Operational Monitoring and Maintenance explanation →

Which TWO statements are true about the 'show interfaces ge-0/0/0 extensive' command output?

Question 10hardmulti select
Review the full routing breakdown →

Which THREE commands are used for operational monitoring of routing protocols?

Question 11mediummulti select
Read the full Operational Monitoring and Maintenance explanation →

Which TWO statements are correct about the 'monitor interface' command?

Question 12hardmultiple choice
Open the full BGP breakdown →

You are managing a Juniper MX router that serves as a BGP route reflector for multiple customer VPNs. The router has two routing engines (RE0 and RE1) in a graceful switchover (GRES) configuration. During a routine maintenance window, you need to upgrade the Junos OS from version 18.1R1 to 20.2R2. The upgrade must minimize traffic disruption. You have already staged the new image on both REs. Which sequence of commands ensures minimal impact?

Question 13mediummultiple choice
Review the full OSPF breakdown →

You are troubleshooting an OSPF issue on a Juniper router. The router has a single interface ge-0/0/1 with IP 10.1.1.1/30 connected to a neighbor with IP 10.1.1.2/30. OSPF is configured area 0. The 'show ospf neighbor' command shows no neighbors. 'show interfaces ge-0/0/1 terse' shows the interface is up. 'show configuration protocols ospf' shows:

area 0.0.0.0 {
       interface ge-0/0/1.0 {

passive;

}
   }

What is the problem?

Question 14mediummultiple choice
Review the full routing breakdown →

A network engineer notices that traffic to a critical server is being dropped intermittently. The server is reachable via a static route on the Juniper router. The engineer checks the routing table and sees the route is present. Which operational command should the engineer use next to isolate the issue?

Question 15hardmulti select
Read the full Operational Monitoring and Maintenance explanation →

Which THREE statements about the 'request system snapshot' command are true? (Choose three.)

Question 16easymultiple choice
Read the full Operational Monitoring and Maintenance explanation →

Based on the exhibit, which protocol is enabled on interface ge-0/0/0.0?

Exhibit

Refer to the exhibit.

user@router> show interfaces ge-0/0/0.0
  Logical interface ge-0/0/0.0 (Index 70) (SNMP ifIndex 521)
    Flags: Up SNMP-Traps 0x4004000 Encapsulation: ENET2
    Input packets : 1500
    Output packets: 1200
    Security: Zone: Trust
    Allowed host-inbound traffic : any-service
    Protocols:
      inet:
        10.0.0.1/24
      iso:
      mpls:
        Maximum labels: 3
      multiservice:
        encapsulation: ethernet-ccc
Question 17hardmultiple choice
Review the full routing breakdown →

You are the network administrator for a large enterprise with a Juniper MX480 router running Junos 18.2R3. The router has two Routing Engines (RE0 and RE1) in a graceful Routing Engine switchover (GRES) configuration. During a scheduled maintenance window, you need to upgrade the Junos OS to a newer version while minimizing traffic loss. The upgrade process requires a reboot of both REs. You have staged the software on both REs. Which sequence of commands should you use to perform the upgrade with minimal disruption?

Question 18mediummulti select
Read the full Operational Monitoring and Maintenance explanation →

Which TWO statements correctly describe the use of the 'monitor traffic' command in Junos?

Question 19hardmultiple choice
Read the full Operational Monitoring and Maintenance explanation →

Refer to the exhibit. A network engineer sees repeated 'PFE interrupt error' messages in the log for fpc0. What is the most likely impact and recommended action?

Exhibit

Refer to the exhibit.

user@router> show log messages | match "fpc0"
Dec 10 14:22:01 router fpc0 MCSCHED: PFE interrupt error, restarting...
Dec 10 14:22:05 router fpc0 MCSCHED: PFE interrupt error, restarting...
Dec 10 14:22:09 router fpc0 MCSCHED: PFE interrupt error, restarting...
Dec 10 14:22:13 router fpc0 MCSCHED: PFE interrupt error, restarting...
Dec 10 14:22:17 router fpc0 MCSCHED: PFE interrupt error, restarting...
Question 20easymultiple choice
Review the full routing breakdown →

You are managing a Juniper MX240 router at a small ISP. The router has been operating normally for months. This morning, a customer reports intermittent packet loss on their connection, which is served by interface ge-0/0/2. You SSH into the router and run 'show interfaces ge-0/0/2 extensive'. The output shows input errors increasing rapidly, including CRC errors and frame errors. The interface is up/up. You also notice that the interface statistics show a high number of carrier transitions. The cable connecting the router to the customer's CPE was recently replaced by the customer's technician. What is the most likely cause of the errors and the correct action to resolve the issue?

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Frequently asked questions

What does the JNCIA-JUNOS exam test about Operational Monitoring and Maintenance?
Operational Monitoring and Maintenance 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 Operational Monitoring and Maintenance questions in a focused session?
Yes — the session launcher on this page draws every question from the Operational Monitoring and Maintenance 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.