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Juniper Junos Troubleshooting Sample Questions:

1. 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.

2. Which two statements are correct about the show ospf route and the show route protocols ospf commands? (Choose two.)

A) show ospf route displays the entries in the Open Shortest Path First (OSPF) routing table.
B) show ospf route displays the route entries in the routing table that were learned through OSPF.
C) show route protocols ospf displays the entries in the Open Shortest Path First (OSPF) routing table.
D) show route protocols ospf displays the route entries in the routing table that were learned through OSPF.

3. Which operational CLI command would you use to troubleshoot hardware-related problems?

A) show cli
B) show system
C) show chassis
D) show route

4. Which two features would be deployed to prevent DoS attacks? (Choose two.)

A) periodic packet management (PPM)
B) loopback filter
C) ARP policer
D) Bidirectional Forward Detection (BFD)

5. -- Exhibit -
[edit]
user@router# show interfaces
ge-1/1/2 {
gigether-options {
802.3ad ae0;
}
}
ge-1/1/3 {
gigether-options {
802.3ad ae0;
}
}
ae0 {
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
}
-- Exhibit -
You are asked to configure a LAG. You configure and commit the configuration as shown in the exhibit. When verifying your ae0 interface, you encounter the following error:
[edit] user@router# run show interfaces ae0 error: device ae0 not found
Which command would you use to resolve this problem?

A) set interfaces ae0 aggregated-ether-options lacp active
B) set chassis network-services ethernet
C) set chassis aggregated-devices ethernet device-count 1
D) set chassis alarm ethernet link-down ignore

Solutions: