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Juniper Junos Troubleshooting Sample Questions:

1. Which three statements are correct about ARP related troubleshooting? (Choose three.)

A) Most devices that run the Junos OS allow you to specify a manual ARP entry.
B) The monitor traffic interface <interface-name> command can be used to watch ARP packets.
C) There are no default ARP policers on any devices running the Junos OS.
D) The clear arp command also clears the IPv6 neighbor cache.
E) An individual ARP entry can be cleared using the clear arp hostname command.

2. Which three statements are correct about rpd related troubleshooting on devices running the Junos OS? (Choose three.)

A) A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
B) Excessive protocol tracing can never be a cause for an overworked rpd.
C) A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
D) A possible cause for an overworked rpd is excessive protocol tracing.
E) A log for rpd scheduler slip is a common, harmless syslog and can be ignored.

3. Click the Exhibit button.
-- Exhibit -user@R1> show route 2.2.2.2
user@R1> show route forwarding-table destination 2.2.2.2
Routing table: default.inet Internet: Destination Type RtRef Next hop Type Index NhRef Netif 2.2.2.2/32 user 1 17.1.1.2 ucst 642 9 xe-1/1/0.0
-- Exhibit -
Referring to the exhibit, which statement is true about transit traffic sent to 2.2.2.2?

A) R1 will forward the packet.
B) R1 will redirect the packet to the Routing Engine.
C) R1 will discard the packet.
D) R1 will reject the packet.

4. -- Exhibit -[edit] user@R1# run show interfaces ge-1/1/2 terse Interface Admin Link Proto Local Remote ge-1/1/2 up up ge-1/1/2.0 up up aenet --> ae0.0
[edit] user@R1# run show interfaces ge-1/1/3 terse Interface Admin Link Proto Local Remote ge-1/1/3 up up ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R1# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R1# show interfaces ae0
aggregated-ether-options {
lacp {
periodic slow;
system-priority 200;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
**************************************************************************
[edit]
user@R2# run show interfaces ge-1/1/2 terse
Interface Admin Link Proto Local Remote
ge-1/1/2 up up
ge-1/1/2.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ge-1/1/3 terse
Interface Admin Link Proto Local Remote
ge-1/1/3 up up
ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R2# show interfaces ae0
aggregated-ether-options {
lacp {
periodic fast;
system-priority 100;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
-- Exhibit --
You have configured a LAG and are now enabling LACP on the ae0 interface. You have configured and committed the configuration as shown in the exhibit. However, the exhibit also shows that the ae0 interface is now in the up/down state.
What must you do to resolve this problem?

A) Configure R1's LACP configuration as active.
B) Change the LACP system-priority of R1 to 300.
C) Configure both routers' ae0 LACP configuration to periodic fast.
D) Configure R2's LACP configuration as passive.

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

Solutions: