Juniper Juniper Certifications JN0-690 Questions & Answers

• Question 21:

  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 rollback 0 command to clear the unneeded configurations on the router.

  B. Issue the request system storage cleanup command.

  C. Enter the shell subsystem and issue the rm -rf /junos command.

  D. Use file delete or the shell subsystem to remove files from the /var/tmp directory.

  E. Issue the request system software delete-backup command.

  Correct Answer: BDE

• Question 22:

  You have configured and successfully committed the configuration for nonstop active routing (NSR). Which command would you use to determine if NSR is operating correctly?

  A. Use the show system synchronization command on the master and the backup Routing Engines.

  B. Use the show task replication command only on the master Routing Engine.

  C. Use the show task replication command on the master and the backup Routing Engines.

  D. Use the show system synchronization command only on the master Routing Engine.

  Correct Answer: C

• Question 23:

  Click the Exhibit button.

  -- Exhibit

  user@router> show configuration system services | display inheritance ssh; telnet; -- Exhibit -

  Referring to the exhibit, which two statements are true? (Choose two.)

  A. Inbound FTP connections to the router would not work.

  B. Outbound FTP connections initiated from the router would not work.

  C. Inbound FTP connections to the router would work.

  D. Outbound FTP connections initiated from the router would work.

  Correct Answer: AD

• Question 24:

  Click the Exhibit button.

  -- Exhibit -user@router> show snmp statistics

  SNMP statistics:

  Input:

  Packets: 246213, Bad versions: 12, Bad community names: 12, Bad community uses: 0, ASN parse errors: 0,

  Too bigs: 0, No such names: 0, Bad values: 0,

  Read onlys: 0, General errors: 0,

  Total request varbinds: 227084, Total set varbinds: 67,

  Get requests: 44942, Get nexts: 1 , Set requests: 10712, Get responses: 0, Traps: 0, Silent drops: 0, Proxy drops: 0, Commit pending drops: 0, Throttle drops: 0, V3 Input:

  Unknown security models: 0, Invalid messages: 0

  Unknown pdu handlers: 0, Unavailable contexts: 0

  Unknown contexts: 0, Unsupported security levels: 0

  Not in time windows: 0, Unknown user names: 0

  Unknown engine ids: 0, Wrong digests: 0, Decryption errors: 0 Output:

  Packets: 246093, Too bigs: 0, No such names: 0,

  Bad values: 0, General errors: 0,

  Get requests: 0, Get nexts: 0, Set requests: 0,

  Get responses: 246025, Traps: 0

  -- Exhibit -

  A new SNMP session has recently been implemented on this router and is experiencing problems sending and receiving SNMP information.

  Referring to the exhibit, which two problems are indicated by the received messages from the NMS? (Choose two.)

  A. unsupported SNMP community name

  B. unknown SNMP community name

  C. unsupported SNMP version indicated

  D. invalid SNMP version indicated

  Correct Answer: BC

• Question 25:

  Which three statements are true about performing an ISSU on a Junos device? (Choose three.)

  A. Every PFE on each FPC downloads the new software from the backup RE.

  B. ksyncd synchronizes the kernel on the backup RE with the master RE.

  C. The backup RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.

  D. The master RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.

  E. Any unsupported PICs will cause the ISSU process to fail with "Error: incompatible hardware detected."

  Correct Answer: ABD

• Question 26:

  Using Virtual Router Redundancy Protocol (VRRP), you want to statically force the priorities of the master and backup routers. Which priority would you set on the master router?

  A. 0

  B. 1

  C. 128

  D. 254

  Correct Answer: D

• Question 27:

  A customer operates a multi-vendor production network. They report that LSAs are aging out on Junos devices. Which OSPF parameter must be tuned to prevent this behavior?

  A. LSA refresh interval

  B. hello interval

  C. dead interval

  D. LSA retransmission interval

  Correct Answer: A

• Question 28:

  You have configured graceful Routing Engine switchover (GRES) on your device running the Junos OS. Which command would you run to ensure that GRES is functioning properly?

  A. Issue the show system switchover command from the master Routing Engine.

  B. Issue the show system switchover command from the backup Routing Engine.

  C. Issue the show chassis routing-engine command from the backup Routing Engine.

  D. Issue the show chassis routing-engine command from the master Routing Engine.

  Correct Answer: B

• Question 29:

  Which two actions are required when performing a unified in-service software upgrade (ISSU)? (Choose two.)

  A. You must enable nonstop active routing (NSR).

  B. You must enable graceful Routing Engine switchover (GRES).

  C. You must disable graceful Routing Engine switchover (GRES) if the Layer 2 Control Protocol is in use.

  D. You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.

  Correct Answer: AB

• Question 30:

  Which two tools will help determine the path of a routing loop? (Choose two.)

  A. traceroute

  B. traceoptions

  C. routing table data

  D. SNMP

  Correct Answer: AC