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Juniper JN0-690 Exam Overview:
| Certification Vendor: | Juniper Networks |
| Exam Name: | Junos Troubleshooting |
| Exam Number: | JN0-690 |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple Choice, Drag and Drop, Fill in the Blank |
| Real Exam Qty: | 70 |
| Passing Score: | 65-70% |
| Related Certifications: | JNCIP-SEC JNCIS-SEC JNCIA-Junos |
| Certificate Validity Period: | 3 Years |
| Available Languages: | English |
| Exam Price: | $200–$300 USD |
| 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 |
|---|---|---|
| Control Plane Troubleshooting | 20% | - Control plane protection & DDoS mitigation - Protocol control messages & routing tables - Routing Engine operations & health |
| High Availability & Network Services | 15% | - Chassis cluster & redundancy groups - Graceful restart & non-stop routing - DHCP, DNS, NTP & authentication services |
| Troubleshooting Methodology & Tools | 15% | - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach - Logging, monitoring & packet capture tools |
| Data Plane & Interfaces Troubleshooting | 20% | - CoS, filters & policer issues - Forwarding table & packet flow analysis - Interface configuration, status & errors |
| Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - Ethernet, VLAN, STP & LACP - OSPF, BGP, IS-IS & RIP - VRRP, BFD & high availability protocols |
| Chassis & Hardware Troubleshooting | 15% | - Boot process & system startup problems - Power, cooling & FPC/PIC issues - Hardware components & status monitoring |
Juniper Junos Troubleshooting Sample Questions:
1. What is the name of the routing protocol process on a Junos OS device?
A) chassisd
B) snmpd
C) cosd
D) rpd
2. Which statement is correct about troubleshooting?
A) Establishing a network baseline is important to help understand when something is not working.
B) You must always have a complete understanding of the problem before you begin gathering any information.
C) The problem must be reproducible before attempting a potential solution.
D) You must be sure the problem will be resolved before attempting a potential solution.
3. An interface on your Junos device reports a device-level flag of Loopback-detected.
What is causing this flag to be reported?
A) The interface is in promiscuous mode and sees frames addressed to all physical addresses on the medium.
B) The interface was administratively disabled.
C) The link-layer protocol failed to successfully connect with the remote endpoint.
D) The interface link layer received its own frames.
4. Which three statements are correct about rpd related troubleshooting on devices running the Junos OS? (Choose three.)
A) Excessive protocol tracing can never be a cause for an overworked rpd.
B) A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
C) A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
D) A log for rpd scheduler slip is a common, harmless syslog and can be ignored.
E) A possible cause for an overworked rpd is excessive protocol tracing.
5. Which two tools would be used to troubleshoot BGP peering problems? (Choose two.)
A) traceoptions
B) the monitor traffic interface command
C) the link-state database
D) the inet.3 routing table
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: A | Question # 3 Answer: D | Question # 4 Answer: B,C,E | Question # 5 Answer: A,B |
Juniper JN0-690 Exam Overview:
| Certification Vendor: | Juniper Networks |
| Exam Name: | Junos Troubleshooting |
| Exam Number: | JN0-690 |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple Choice, Drag and Drop, Fill in the Blank |
| Real Exam Qty: | 70 |
| Passing Score: | 65-70% |
| Related Certifications: | JNCIP-SEC JNCIS-SEC JNCIA-Junos |
| Certificate Validity Period: | 3 Years |
| Available Languages: | English |
| Exam Price: | $200–$300 USD |
| 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 |
|---|---|---|
| Control Plane Troubleshooting | 20% | - Control plane protection & DDoS mitigation - Protocol control messages & routing tables - Routing Engine operations & health |
| High Availability & Network Services | 15% | - Chassis cluster & redundancy groups - Graceful restart & non-stop routing - DHCP, DNS, NTP & authentication services |
| Troubleshooting Methodology & Tools | 15% | - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach - Logging, monitoring & packet capture tools |
| Data Plane & Interfaces Troubleshooting | 20% | - CoS, filters & policer issues - Forwarding table & packet flow analysis - Interface configuration, status & errors |
| Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - Ethernet, VLAN, STP & LACP - OSPF, BGP, IS-IS & RIP - VRRP, BFD & high availability protocols |
| Chassis & Hardware Troubleshooting | 15% | - Boot process & system startup problems - Power, cooling & FPC/PIC issues - Hardware components & status monitoring |
Juniper Junos Troubleshooting Sample Questions:
1. What is the name of the routing protocol process on a Junos OS device?
A) chassisd
B) snmpd
C) cosd
D) rpd
2. Which statement is correct about troubleshooting?
A) Establishing a network baseline is important to help understand when something is not working.
B) You must always have a complete understanding of the problem before you begin gathering any information.
C) The problem must be reproducible before attempting a potential solution.
D) You must be sure the problem will be resolved before attempting a potential solution.
3. An interface on your Junos device reports a device-level flag of Loopback-detected.
What is causing this flag to be reported?
A) The interface is in promiscuous mode and sees frames addressed to all physical addresses on the medium.
B) The interface was administratively disabled.
C) The link-layer protocol failed to successfully connect with the remote endpoint.
D) The interface link layer received its own frames.
4. Which three statements are correct about rpd related troubleshooting on devices running the Junos OS? (Choose three.)
A) Excessive protocol tracing can never be a cause for an overworked rpd.
B) A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
C) A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
D) A log for rpd scheduler slip is a common, harmless syslog and can be ignored.
E) A possible cause for an overworked rpd is excessive protocol tracing.
5. Which two tools would be used to troubleshoot BGP peering problems? (Choose two.)
A) traceoptions
B) the monitor traffic interface command
C) the link-state database
D) the inet.3 routing table
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: A | Question # 3 Answer: D | Question # 4 Answer: B,C,E | Question # 5 Answer: A,B |
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