Instant Download Juniper : JN0-690 Questions & Answers
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Check Updated on: Oct 15, 2026
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JN0-690 PDF Practice Q&A's
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Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Chassis & Hardware Troubleshooting | 15% | - Power, cooling & FPC/PIC issues - Boot process & system startup problems - Hardware components & status monitoring |
| High Availability & Network Services | 15% | - Chassis cluster & redundancy groups - Graceful restart & non-stop routing - DHCP, DNS, NTP & authentication services |
| Control Plane Troubleshooting | 20% | - Protocol control messages & routing tables - Control plane protection & DDoS mitigation - Routing Engine operations & health |
| Data Plane & Interfaces Troubleshooting | 20% | - Interface configuration, status & errors - Forwarding table & packet flow analysis - CoS, filters & policer issues |
| Troubleshooting Methodology & Tools | 15% | - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach - Logging, monitoring & packet capture tools |
| Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - Ethernet, VLAN, STP & LACP - VRRP, BFD & high availability protocols |
Juniper Junos Troubleshooting Sample Questions:
Which operational command would be used to display diagnostic data and alarms for 1/10/100 Gigabit Ethernet optical transceivers?
- A. show interfaces diagnostics optics
- B. show interfaces controller
- C. show chassis alarms
- D. show interfaces extensive
Correct Answer: A 🗳️
Which three statements are true about performing an ISSU on a Junos device? (Choose three.)
- A. ksyncd synchronizes the kernel on the backup RE with the master RE.
- B. Any unsupported PICs will cause the ISSU process to fail with "Error: incompatible hardware detected."
- C. The master RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
- D. The backup RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
- E. Every PFE on each FPC downloads the new software from the backup RE.
Correct Answer: A,C,E 🗳️
Which CLI command would be used to verify the routing protocol daemon memory usage?
- A. show route summary
- B. show chassis routing-engine
- C. show system processes extensive
- D. show route detail
Correct Answer: C 🗳️
Which route would a packet destined to 192.168.14. take?
- A. 192.168.14.0/24 *[BGP/70]
- B. 192.168.14.0/24 *[BGP/100]
- C. 192.168.14.0/24 *[BGP/200]
- D. 192.168.64.0/21 *[Direct/0]
Correct Answer: A 🗳️
Which three steps are involved in troubleshooting any problem? (Choose three.)
- A. Determine who made the changes.
- B. Outline the expected behavior.
- C. Clearly define the problem.
- D. Isolate the problem.
- E. Reboot the device.
Correct Answer: B,C,D 🗳️
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