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Juniper Junos Troubleshooting Sample Questions:

1. 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 soft
C) restart chassis-control immediately
D) restart routing

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) The boot failed because a USB drive has been inserted into the device.
E) Running fsck on the partition might resolve the boot problem.

3. 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 walk
B) show snmp mib get
C) show snmp v3
D) show snmp statistics

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

5. In Junos, which process has its own internal task scheduler?

A) ppmd
B) mgd
C) chassisd
D) rpd

Solutions: