Juniper JN0-690 : Junos Troubleshooting

JN0-690 pass collection

Exam Code: JN0-690

Exam Name: Junos Troubleshooting

Updated: Jul 24, 2026

Q & A: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

SectionObjectives
Services and Protocol Troubleshooting- NAT and firewall filter behavior
- VPN and tunnel troubleshooting
Interface and Layer 2 Troubleshooting- VLAN and switching issues
- Interface status and error diagnosis
Junos OS Fundamentals and Architecture- System operation and maintenance basics
- Junos OS process architecture and components
Routing Policy and Filter Issues- Policy application and route selection
- Filter evaluation and debugging
Layer 3 Routing Troubleshooting- Static routing and route lookup issues
- BGP troubleshooting
- OSPF troubleshooting
System Monitoring and Diagnostics- Performance and connectivity analysis tools
- Logs, traces, and system alarms

Juniper Junos Troubleshooting Sample Questions:

1. By default, in which table are OSPF routes stored on a Junos device?

A) inet.1
B) inet.3
C) inet.2
D) inet.0


2. Which command would be helpful in determining the time at which the protocols started?

A) show configuration
B) show chassis hardware
C) show system uptime
D) show route


3. You are notified about a router reboot event.
Which command would be helpful in determining the reason for the last reboot?

A) show chassis routing-engine
B) show chassis craft-interface
C) show system reboot
D) show system snapshot


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

A) You must disable graceful Routing Engine switchover (GRES) if the Layer 2 Control Protocol is in use.
B) You must enable nonstop active routing (NSR).
C) You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.
D) You must enable graceful Routing Engine switchover (GRES).


5. In Junos, which process has its own internal task scheduler?

A) ppmd
B) chassisd
C) rpd
D) mgd


Solutions:

Question # 1
Answer: D
Question # 2
Answer: C
Question # 3
Answer: A
Question # 4
Answer: B,D
Question # 5
Answer: C

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