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Troubleshooting Scenario Questions

Practise Juniper Networks Certified Associate Junos JNCIA-Junos practice questions — original exam-style scenarios covering every exam domain, with detailed explanations, wrong-answer analysis, and common exam traps.

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15
scenario questions
JNCIA-JUNOS
exam code
Juniper Networks
vendor

Scenario guide

How to approach troubleshooting scenario questions

These questions describe a network symptom and ask you to identify the root cause or the correct fix. They appear across all certification exams and reward systematic thinking over memorisation. The best candidates follow a consistent troubleshooting framework even under time pressure.

Quick answer

Troubleshooting Scenario Questions 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.

Related practice questions

Related JNCIA-JUNOS topic practice pages

Scenario questions usually connect to one or more exam topics. Use these links to review the underlying concepts behind the scenario.

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JNCIA-JUNOS troubleshooting practice questions

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Practice set

Practice scenarios

Question 1easymultiple choice
Review the full routing breakdown →

A network engineer is troubleshooting a connectivity issue and wants to see the active routes in the routing table. Which Junos CLI command should they use?

Question 2mediummultiple choice
Review the full routing breakdown →

A network engineer is troubleshooting a reachability issue between two directly connected routers. Both routers have IP addresses configured on their interfaces and the interfaces are up. Which command would the engineer use to verify the routing table entry for the remote network?

Question 3mediummultiple choice
Review the full routing breakdown →

A network engineer is troubleshooting connectivity between two directly connected Juniper routers. The interface on Router A shows 'up' but no packets are being received from Router B. Which command should the engineer use on Router A to check if the interface is expecting to receive a specific encapsulation type?

Question 4hardmultiple choice
Review the full OSPF breakdown →

You are a junior network engineer at a company that uses Juniper MX routers. You are troubleshooting a connectivity issue on a branch router. The branch router has two upstream links to the corporate network: ge-0/0/0 (10.1.1.1/30, connected to core router A) and ge-0/0/1 (10.1.1.5/30, connected to core router B). The branch router runs OSPF and has a default route learned from both upstream routers. The routing table shows two equal-cost default routes via both next hops. However, traffic from the branch to the corporate network is experiencing intermittent high latency and some packet loss. You suspect that asymmetric routing is causing issues because the return traffic is not following the same path. You want to influence the router to prefer one upstream link for all traffic to the corporate network. You have decided to adjust the OSPF metric on the branch router to make the link to core router A more preferred. You are in configuration mode on the branch router. Which single configuration change will accomplish this goal?

Question 5hardmultiple choice
Review the full OSPF breakdown →

A network engineer is troubleshooting OSPF adjacencies between two Juniper routers. The routers are directly connected and have matching OSPF configurations except for the router IDs. Router A has router-id 10.0.0.1, Router B has router-id 10.0.0.2. The adjacency remains in the EXSTART state. What is the most likely cause?

Question 6hardmultiple choice
Full question →

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

Question 7hardmultiple 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 8hardmultiple 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 9mediummultiple choice
Read the full NAT/PAT explanation →

A junior engineer is troubleshooting connectivity issues and wants to trace the path packets take to a remote destination. Which Junos command should be used?

Question 10mediummultiple 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 11hardmultiple choice
Full question →

During a maintenance window, an engineer issues 'commit confirmed 5' but the change causes a connectivity loss. The engineer is unable to reconnect to the device before the timeout expires. What will happen?

Question 12easymultiple choice
Full question →

A network administrator is troubleshooting high latency on a link. Which command provides real-time interface statistics?

Question 13mediummultiple choice
Open the full VLAN trunking answer →

A network engineer is troubleshooting connectivity between two VLANs on the same Juniper EX switch. Hosts in VLAN 100 cannot ping hosts in VLAN 200. The switch has an IRB interface configured for each VLAN. Which configuration is most likely missing?

Question 14mediummultiple choice
Open the full BGP breakdown →

A network engineer is troubleshooting a BGP session that is not establishing. They want to see the BGP configuration details for peer 10.0.0.1. They type 'show configuration protocols bgp group external peer 10.0.0.1' but receive 'error: syntax error'. They are in operational mode. What is the most likely issue?

Question 15mediummultiple choice
Open the full VLAN trunking answer →

You are troubleshooting a network connectivity issue at a medium-sized company that uses Juniper EX4300 switches. Users in VLAN 100 (10.10.100.0/24) report that they cannot access a server in VLAN 200 (10.10.200.0/24). The switch has IRB interfaces configured for both VLANs and is acting as the default gateway. The IRB interfaces are up and have correct IP addresses. The server and users have correct IP configurations. 'show arp' on the switch shows incomplete entries for some hosts in VLAN 100. 'show ethernet-switching table' shows MAC addresses for users are present on the correct access ports. However, pings from the switch to a user in VLAN 100 fail. What is the most likely issue?

These JNCIA-JUNOS practice questions are part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style JNCIA-JUNOS questions with detailed explanations, topic-based practice, mock exams, readiness tracking, and study analytics.