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JNCIP-ENT · topic practice

Troubleshooting practice questions

Practise Juniper Networks Enterprise Routing and Switching, Professional (JNCIP-ENT, JN0-650) (JNCIP-ENT) Troubleshooting 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: Troubleshooting

What the exam tests

What to know about Troubleshooting

Troubleshooting 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 Troubleshooting 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

Troubleshooting questions

20 questions · select your answer, then reveal the explanation

You are troubleshooting a scenario where multi-field classifiers and behavior aggregate classifiers are both configured on the same ingress interface. In what order does Junos process classification?

Question 2mediummultiple choice
Open the full BGP breakdown →

An engineer is troubleshooting a BGP route reflection topology where a non-client IBGP peer sends a route to a route reflector. Will the route reflector reflect this route to other non-client IBGP peers?

You are troubleshooting MAC address learning on an EX Series switch and want to display dynamic MAC entries learned specifically on interface ge-0/0/5. Which operational command should you use?

Question 4mediummultiple choice
Read the full VPN explanation →

An engineer is troubleshooting a newly configured EVPN-VXLAN multi-homed setup where the Designated Forwarder (DF) is constantly toggling between two PE routers. What is the most likely cause of this DF churn?

Question 5mediummulti select
Read the full VPN explanation →

When troubleshooting EVPN control plane connectivity in Junos OS, which THREE commands provide essential diagnostic information regarding EVPN routing tables and peers? (Choose three)

Question 6hardmultiple choice
Review the full OSPF breakdown →

You are troubleshooting an OSPF network where virtual links are deployed to connect a non-backbone area to Area 0 across a transit area. Which statement is true regarding virtual link configuration in Junos?

An administrator is troubleshooting an MSDP deployment between two autonomous systems. Which THREE factors can cause an MSDP peer session to fail to establish? (Choose three)

Question 8mediummultiple choice
Study the full QoS explanation →

You are troubleshooting voice quality issues on an IP phone connected to an EX Series switch. You suspect that the switch is not trusting the DSCP markings (DSCP 46) sent by the IP phone. Which Junos class-of-service (CoS) configuration ensures that incoming voice traffic DSCP bits are trusted at the ingress interface?

An engineer is troubleshooting multicast forwarding and RPF failures on a Junos routing instance. Which THREE conditions will cause a multicast RPF check failure? (Choose three)

Question 10mediummulti select
Review the full OSPF breakdown →

Which TWO commands are used to troubleshoot OSPF issues on Junos devices? (Choose two)

Question 11hardmultiple choice
Open the full VLAN trunking answer →

An administrator troubleshooting an IGMP snooping issue on an EX Series switch notices that multicast traffic is flooding all ports in a VLAN. Which Junos command verifies the IGMP snooping status and active querier on a specific VLAN?

Question 12mediummultiple choice
Study the full multicast explanation →

An engineer is troubleshooting PIM Sparse-Mode on a Junos device and notices that source traffic is not switching from the shared tree (*,G) to the shortest path tree (S,G) at the Last-Hop Router. Which configuration statement on the Junos routing instance allows adjusting the threshold for this switchover behavior?

You are troubleshooting a power budget shortfall on an EX4300 switch where multiple PoE devices are failing to power up. Which TWO actions can you take to resolve or mitigate this power deficit? (Choose two.)

Question 14hardmultiple choice
Study the full multicast explanation →

During multicast troubleshooting, an engineer notices that a router is not accepting MSDP Source-Active messages from a specific peer. Where should an export policy be applied to control which SA messages are sent or accepted via MSDP?

An administrator notices that LLDP neighbors are failing to populate on an EX Series switch interface. Which THREE troubleshooting steps should be performed? (Choose three.)

Question 16mediummultiple choice
Read the full Troubleshooting explanation →

You are troubleshooting an issue where an 802.1X supplicant on a Windows client fails to connect to an EX Series switch port. The switch logs show 'EAPOL-TIMEOUT' errors. What does this error indicate?

Question 17hardmultiple choice
Open the full BGP breakdown →

You are troubleshooting a BGP route selection issue on a Junos device. Two otherwise identical paths are received from external peers. According to the standard BGP route selection algorithm implemented by Junos, which tie-breaking attribute is evaluated immediately AFTER comparing the Router ID (RID) of the advertising routers?

Question 18hardmultiple choice
Read the full Troubleshooting explanation →

An engineer is troubleshooting a large-scale enterprise network with multiple MSTP regions connected by a legacy RSTP region. How do boundary switches running MSTP interact with RSTP switches on shared segments?

Which TWO operational commands are valid for troubleshooting VSTP on Juniper EX switches? (Choose two)

Question 20mediummultiple choice
Open the full VLAN trunking answer →

You are troubleshooting a Q-in-Q tunneling implementation on an MX Series router where customer VLAN tags are being stripped instead of preserved across the service provider core. Under which configuration hierarchy should the 'vlan-tagging' and 'pop-pop' or 'push' actions be applied on the interface?

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Focused Troubleshooting sessions

Start a Troubleshooting only practice session

Every question in these sessions is drawn from the Troubleshooting domain — nothing else.

Related practice questions

Related JNCIP-ENT topic practice pages

Move into related areas when this topic feels solid.

Frequently asked questions

What does the JNCIP-ENT exam test about Troubleshooting?
Troubleshooting 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 Troubleshooting questions in a focused session?
Yes — the session launcher on this page draws every question from the Troubleshooting 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 JNCIP-ENT topics?
Use the topic links above to move to related areas, or go back to the JNCIP-ENT 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 JNCIP-ENT exam covers. They are not copied from any real exam or dump site.