Juniper JN0-690 : Junos Troubleshooting

JN0-690 real exams

Exam Code: JN0-690

Exam Name: Junos Troubleshooting

Updated: May 28, 2026

Q & A: 70 Questions and Answers

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Juniper Junos Troubleshooting Sample Questions:

1. Which three commands will provide details about CPU utilization on a line card? (Choose three.)

A) show chassis hardware
B) request pfe execute target fpc1 command "show arp"
C) show chassis fpc
D) request pfe execute target fpc1 command "show sched"
E) request pfe execute target fpc1 command "show thread"


2. What controls the CLI process?

A) chassis control daemon
B) management daemon
C) device control daemon
D) routing protocol process


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) Issue the request system storage cleanup command.
C) Issue the rollback 0 command to clear the unneeded configurations on the router.
D) Issue the request system software delete-backup command.
E) Use file delete or the shell subsystem to remove files from the /var/tmp directory.


4. Which route would a packet destined to 192.168.14. take?

A) 192.168.64.0/21 *[Direct/0]
B) 192.168.14.0/24 *[BGP/100]
C) 192.168.14.0/24 *[BGP/70]
D) 192.168.14.0/24 *[BGP/200]


5. Which CLI command applies the candidate configuration to the active configuration?

A) commit
B) copy run start
C) load
D) merge


Solutions:

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

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