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Updated: Sep 15, 2026
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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Junos OS Fundamentals and Architecture | - Junos OS process architecture and components - System operation and maintenance basics |
| Topic 2: Interface and Layer 2 Troubleshooting | - VLAN and switching issues - Interface status and error diagnosis |
| Topic 3: Layer 3 Routing Troubleshooting | - BGP troubleshooting - Static routing and route lookup issues - OSPF troubleshooting |
| Topic 4: Services and Protocol Troubleshooting | - VPN and tunnel troubleshooting - NAT and firewall filter behavior |
| Topic 5: Routing Policy and Filter Issues | - Filter evaluation and debugging - Policy application and route selection |
| Topic 6: System Monitoring and Diagnostics | - Logs, traces, and system alarms - Performance and connectivity analysis tools |
Juniper Junos Troubleshooting Sample Questions:
Which two actions are required when performing a unified in-service software upgrade (ISSU)? (Choose two.)
- A. You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.
- B. You must enable nonstop active routing (NSR).
- C. You must enable graceful Routing Engine switchover (GRES).
- D. You must disable graceful Routing Engine switchover (GRES) if the Layer 2 Control Protocol is in use.
Correct Answer: B,C 🗳️
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. Issue the request system software delete-backup command.
- B. Enter the shell subsystem and issue the rm -rf /junos command.
- C. Use file delete or the shell subsystem to remove files from the /var/tmp directory.
- D. Issue the rollback 0 command to clear the unneeded configurations on the router.
- E. Issue the request system storage cleanup command.
Correct Answer: A,C,E 🗳️
You want to reset all the PFE components with graceful Routing Engine switchover (GRES) disabled on the system. Which command should you use?
- A. restart chassis-control
- B. restart chassis-control immediately
- C. restart routing
- D. restart chassis-control soft
Correct Answer: A 🗳️
By default, in which table are OSPF routes stored on a Junos device?
- A. inet.3
- B. inet.2
- C. inet.0
- D. inet.1
Correct Answer: C 🗳️
Click the Exhibit button.
-- Exhibit -user@host> request system software add ... WARNING: The /var filesystem is low on free disk space. WARNING: This package requires 1 k free, but there WARNING: is only 666502k available. -- Exhibit -
Which three commands are useful in identifying and addressing the cause of the lack of disk space? (Choose three.)
- A. show system storage
- B. show system directory-usage
- C. show chassis routing-engine
- D. request system storage cleanup
- E. request system software add validate
Correct Answer: A,B,D 🗳️
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