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Updated: Jul 29, 2026
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Juniper JN0-690 Exam Overview:
| Certification Vendor: | Juniper Networks |
| Exam Name: | Junos Troubleshooting |
| Exam Number: | JN0-690 |
| Related Certifications: | JNCIP-SEC JNCIS-SEC JNCIA-Junos |
| Exam Format: | Multiple Choice, Drag and Drop, Fill in the Blank |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 Years |
| Exam Price: | $200–$300 USD |
| Passing Score: | 65-70% |
| Available Languages: | English |
| Real Exam Qty: | 70 |
| Recommended Training: | Junos Troubleshooting (EDU-JUN-IJS) Introduction to Junos Operating System |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Juniper JN0-690 Sample Questions |
| Exam Way: | In-person at Pearson VUE test centers; retired April 30, 2015, replaced by JN0-691 |
| Pre Condition: | Recommended: JNCIA-Junos certification or equivalent knowledge; working experience with Junos OS |
| Official Syllabus URL: | https://www.juniper.net/us/en/training/certification.html |
Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Control Plane Troubleshooting | 20% | - Routing Engine operations & health - Control plane protection & DDoS mitigation - Protocol control messages & routing tables |
| Topic 2: Data Plane & Interfaces Troubleshooting | 20% | - Forwarding table & packet flow analysis - Interface configuration, status & errors - CoS, filters & policer issues |
| Topic 3: Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - Ethernet, VLAN, STP & LACP - VRRP, BFD & high availability protocols |
| Topic 4: High Availability & Network Services | 15% | - DHCP, DNS, NTP & authentication services - Chassis cluster & redundancy groups - Graceful restart & non-stop routing |
| Topic 5: Troubleshooting Methodology & Tools | 15% | - Junos CLI commands & diagnostic utilities - Logging, monitoring & packet capture tools - Systematic troubleshooting approach |
| Topic 6: Chassis & Hardware Troubleshooting | 15% | - Hardware components & status monitoring - Boot process & system startup problems - Power, cooling & FPC/PIC issues |
Juniper Junos Troubleshooting Sample Questions:
1. In Junos, which process has its own internal task scheduler?
A) chassisd
B) rpd
C) ppmd
D) mgd
2. Click the Exhibit button.
-- Exhibit -
Slot 0 information: State Online Total CPU DRAM ---- CPU less FPC ---Start time 2012-07-07 03:21:00 UTC Uptime 27 minutes, 51 seconds Slot 1 information: State Present Reason --- Hardware Not In Right Slot --Slot 2 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:20:59 UTC Uptime 27 minutes, 52 seconds Slot 3 information: State Present Reason --- Hardware Not Supported --Total CPU DRAM 0 MB Slot 6 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:21:01 UTC Uptime 27 minutes, 50 seconds
-- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)
A) The Control Board in slot 6 is online and working.
B) The Flexible PIC Concentrator (FPC) in slot 1 is not installed properly for this chassis.
C) The Control Board in slot 0 has a missing CPU.
D) The Flexible PIC Concentrator (FPC) in slot 6 is online and working.
E) The card in slot 3 is not supported by the chassis.
3. 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 only on the master Routing Engine.
B) Use the show task replication 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 system synchronization command on the master and the backup Routing Engines.
4. Which two Junos OS commands are helpful in confirming whether an Object Identifier (OID) has recorded the correct data? (Choose two.)
A) show snmp v3
B) show snmp statistics
C) show snmp mib get
D) show snmp mib walk
5. Which two statements are true about firewall filters and policers? (Choose two.)
A) If an input firewall filter is configured on the same logical interface as a policer, the policer is executed first.
B) If an output firewall filter is configured on the same logical interface as a policer, the policer is executed first.
C) If an output firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
D) If an input firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: B,D,E | Question # 3 Answer: C | Question # 4 Answer: C,D | Question # 5 Answer: A,C |
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