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Updated: Aug 02, 2026
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Juniper JN0-690 Exam Overview:
| Certification Vendor: | Juniper Networks |
| Exam Name: | Junos Troubleshooting Specialist Exam (JN0-690) |
| Exam Number: | JN0-690 |
| Exam Format: | Multiple choice, Scenario-based questions |
| Related Certifications: | Juniper Networks Certified Associate - Junos (JNCIA-Junos) Juniper Networks Certified Specialist - Enterprise Routing and Switching |
| Available Languages: | English |
| Recommended Training: | Juniper Training Courses (Official) |
| Exam Registration: | Pearson VUE Juniper Exams Juniper Certification Portal |
| Sample Questions: | Juniper JN0-690 Sample Questions |
| Exam Way: | Online proctored or test center delivery (Pearson VUE) |
| Pre Condition: | Recommended prior experience with Junos OS and routing fundamentals; Juniper associate-level knowledge (e.g., JNCIA-Junos) is typically expected. |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification.html |
Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Layer 3 Routing Troubleshooting | - OSPF troubleshooting - BGP troubleshooting - Static routing and route lookup issues |
| Services and Protocol Troubleshooting | - VPN and tunnel troubleshooting - NAT and firewall filter behavior |
| System Monitoring and Diagnostics | - Logs, traces, and system alarms - Performance and connectivity analysis tools |
| Junos OS Fundamentals and Architecture | - System operation and maintenance basics - Junos OS process architecture and components |
| Interface and Layer 2 Troubleshooting | - Interface status and error diagnosis - VLAN and switching issues |
| Routing Policy and Filter Issues | - Policy application and route selection - Filter evaluation and debugging |
Juniper Junos Troubleshooting Sample Questions:
1. Which route would a packet destined to 192.168.14. take?
A) 192.168.14.0/24 *[BGP/100]
B) 192.168.14.0/24 *[BGP/70]
C) 192.168.64.0/21 *[Direct/0]
D) 192.168.14.0/24 *[BGP/200]
2. Which CLI command is used to restart a software process?
A) restart
B) reload
C) reboot
D) commit
3. 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 lab user's session will be cleared after issuing the command request system logout user lab.
B) The admin user is connected through a Telnet or SSH session.
C) Both user sessions will be cleared after issuing the command request system logout terminal.
D) The admin user is connected through a console session.
4. Which three statements are correct about rpd related troubleshooting on devices running the Junos OS? (Choose three.)
A) A log for rpd scheduler slip is a common, harmless syslog and can be ignored.
B) A possible cause for an overworked rpd is excessive protocol tracing.
C) Excessive protocol tracing can never be a cause for an overworked rpd.
D) A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
E) A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
5. Click the Exhibit button.
-- Exhibit -user@host> request system software add ... WARNING: The /var filesystem is low on free disk space. WARNING: This package requires 1 k free, but there WARNING: is only 666502k available. -- Exhibit -
Which three commands are useful in identifying and addressing the cause of the lack of disk space? (Choose three.)
A) show system directory-usage
B) request system software add validate
C) show chassis routing-engine
D) show system storage
E) request system storage cleanup
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: A | Question # 3 Answer: A,B | Question # 4 Answer: B,D,E | Question # 5 Answer: A,D,E |
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