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Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - VRRP, BFD & high availability protocols - Ethernet, VLAN, STP & LACP - OSPF, BGP, IS-IS & RIP |
| Topic 2: High Availability & Network Services | 15% | - Chassis cluster & redundancy groups - DHCP, DNS, NTP & authentication services - Graceful restart & non-stop routing |
| Topic 3: Troubleshooting Methodology & Tools | 15% | - Logging, monitoring & packet capture tools - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach |
| Topic 4: Data Plane & Interfaces Troubleshooting | 20% | - Forwarding table & packet flow analysis - Interface configuration, status & errors - CoS, filters & policer issues |
| Topic 5: Control Plane Troubleshooting | 20% | - Routing Engine operations & health - Protocol control messages & routing tables - Control plane protection & DDoS mitigation |
| Topic 6: Chassis & Hardware Troubleshooting | 15% | - Hardware components & status monitoring - Power, cooling & FPC/PIC issues - Boot process & system startup problems |
Juniper Junos Troubleshooting Sample Questions:
Which CLI command applies the candidate configuration to the active configuration?
- A. load
- B. copy run start
- C. commit
- D. merge
Correct Answer: C 🗳️
Explanation: Only visible for PassReview members. You can sign-up / login (it's free).
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 system synchronization command only on the master Routing Engine.
- D. Use the show task replication command on the master and the backup Routing Engines.
Correct Answer: D 🗳️
Which command would be helpful in determining the time at which the protocols started?
- A. show chassis hardware
- B. show configuration
- C. show route
- D. show system uptime
Correct Answer: D 🗳️
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. Enter the shell subsystem and issue the rm -rf /junos command.
- C. Use file delete or the shell subsystem to remove files from the /var/tmp directory.
- D. Issue the request system storage cleanup command.
- E. Issue the request system software delete-backup command.
Correct Answer: C,D,E 🗳️
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. invalid SNMP version indicated
- C. unsupported SNMP version indicated
- D. unknown SNMP community name
Correct Answer: C,D 🗳️
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