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Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Data Plane & Interfaces Troubleshooting | 20% | - CoS, filters & policer issues - Forwarding table & packet flow analysis - Interface configuration, status & errors |
| High Availability & Network Services | 15% | - DHCP, DNS, NTP & authentication services - Graceful restart & non-stop routing - Chassis cluster & redundancy groups |
| Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - VRRP, BFD & high availability protocols - Ethernet, VLAN, STP & LACP |
| Control Plane Troubleshooting | 20% | - Protocol control messages & routing tables - Routing Engine operations & health - Control plane protection & DDoS mitigation |
| Chassis & Hardware Troubleshooting | 15% | - Power, cooling & FPC/PIC issues - Hardware components & status monitoring - Boot process & system startup problems |
| Troubleshooting Methodology & Tools | 15% | - Systematic troubleshooting approach - Junos CLI commands & diagnostic utilities - Logging, monitoring & packet capture tools |
Juniper Junos Troubleshooting Sample Questions:
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. invalid SNMP version indicated
- B. unsupported SNMP version indicated
- C. unsupported SNMP community name
- D. unknown SNMP community name
Correct Answer: B,D 🗳️
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 system synchronization 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 task replication command only on the master Routing Engine.
Correct Answer: C 🗳️
Click the Exhibit button.
-- Exhibit -user@router> show system users
9:28PM up 2 days, 3:02, 2 users, load averages: 0.06, 0.13, 0.09 USER TTY FROM LOGIN@ IDLE WHAT lab u0 -9:13PM - -cli (cli) admin p0 10.210.15.30 9:45PM - -cli (cli) -- Exhibit -
Referring to the exhibit, which two statements are true? (Choose two.)
- A. The admin user is connected through a console session.
- B. Both user sessions will be cleared after issuing the command request system logout terminal.
- C. The admin user is connected through a Telnet or SSH session.
- D. The lab user's session will be cleared after issuing the command request system logout user lab.
Correct Answer: C,D 🗳️
Which two actions are required when performing a unified in-service software upgrade (ISSU)? (Choose two.)
- A. You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.
- B. You must enable nonstop active routing (NSR).
- C. You must enable graceful Routing Engine switchover (GRES).
- D. You must disable graceful Routing Engine switchover (GRES) if the Layer 2 Control Protocol is in use.
Correct Answer: B,C 🗳️
An OSPF neighbor is stuck in the Exchange state.
Which condition would cause this to happen?
- A. mismatched authentication
- B. a mismatched IP subnet
- C. a mismatched MTU
- D. a mismatched area
Correct Answer: C 🗳️
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