Juniper JN0-690 Valid Test : Junos Troubleshooting

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Aug 26, 2026
  • Q&As: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

SectionObjectives
Topic 1: Services and Protocol Troubleshooting- NAT and firewall filter behavior
- VPN and tunnel troubleshooting
Topic 2: Routing Policy and Filter Issues- Policy application and route selection
- Filter evaluation and debugging
Topic 3: Junos OS Fundamentals and Architecture- Junos OS process architecture and components
- System operation and maintenance basics
Topic 4: System Monitoring and Diagnostics- Performance and connectivity analysis tools
- Logs, traces, and system alarms
Topic 5: Layer 3 Routing Troubleshooting- OSPF troubleshooting
- BGP troubleshooting
- Static routing and route lookup issues
Topic 6: Interface and Layer 2 Troubleshooting- Interface status and error diagnosis
- VLAN and switching issues

Juniper Junos Troubleshooting Sample Questions:

Question 1

Which two Junos OS commands are helpful in confirming whether an Object Identifier (OID) has recorded the correct data? (Choose two.)

A. show snmp mib get
B. show snmp v3
C. show snmp mib walk
D. show snmp statistics


Question 2

Click the Exhibit button.
-- Exhibit -=================== Bootstrap installer starting =================== Initialized the environment Routing engine model is RE-S-1800x4 Discovered that flash disk = ad0 , hard disk = ad1 mount: /dev/ad1s1f : Invalid argument ERROR: mount_partition: Mount /dev/ad1s1a /mnt failed You are now in a debugging subshell (you may not see a prompt)... # -- Exhibit -
During the boot of your MX480, you see the output shown in the exhibit. Which three statements are true? (Choose three.)

A. The Routing Engine cannot mount the partition to complete booting.
B. You must swap the Routing Engine over to the backup slot to get it to boot properly.
C. The boot failed because one of the file systems is in an inconsistent state.
D. Running fsck on the partition might resolve the boot problem.
E. The boot failed because a USB drive has been inserted into the device.


Question 3

Click the Exhibit button.
-- Exhibit -root@router> show system storage Filesystem Size Used Avail Capacity Mounted on /dev/da0s1a 742M 741M -6.6M 101% /junos/cf devfs 1.0K 1.0K 0B 100% /dev devfs 1.0K 1.0K 0B 100% /dev/ /dev/md0 494M 494M 0B 100% /junos /cf 742M 741M -6.6M 101% /junos/cf devfs 1.0K 1.0K 0B 100% /junos/dev/ procfs 4.0K 4.0K 0B 100% /proc /dev/bo0s3e 24M 108K 22M 0% /config /dev/bo0s3f 342M 110M 205M 35% /cf/var /dev/md1 168M 14M 141M 9% /mfs /cf/var/jail 342M 110M 205M 35% /jail/var devfs 1.0K 1.0K 0B 100% /jail/dev /dev/md2 39M 4.0K 36M 0% /mfs/var/run/utm /dev/md3 1.8M 4.0K 1.7M 0% /jail/mfs -- Exhibit -
Your device running the Junos OS has become slow and you obtain frequent errors when you try to make changes.
Referring to the exhibit, which three actions would resolve the problem? (Choose three.)

A. Enter the shell subsystem and issue the rm -rf /junos command.
B. Use file delete or the shell subsystem to remove files from the /var/tmp directory.
C. Issue the request system software delete-backup command.
D. Issue the request system storage cleanup command.
E. Issue the rollback 0 command to clear the unneeded configurations on the router.


Question 4

Which two commands help to identify traffic drops due to oversubscription? (Choose two.)

A. show interfaces queue
B. monitor interface traffic
C. show interfaces extensive
D. monitor traffic interface


Question 5

An interface on your Junos device reports a device-level flag of Loopback-detected.
What is causing this flag to be reported?

A. The interface is in promiscuous mode and sees frames addressed to all physical addresses on the medium.
B. The link-layer protocol failed to successfully connect with the remote endpoint.
C. The interface was administratively disabled.
D. The interface link layer received its own frames.


Solutions:

Question 1
Answer: A,C
Question 2
Answer: A,C,D
Question 3
Answer: B,C,D
Question 4
Answer: A,C
Question 5
Answer: D

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