Junos Troubleshooting: JN0-690 Exam

"Junos Troubleshooting", also known as JN0-690 exam, is a Juniper Certification. With the complete collection of questions and answers, iPassleader has assembled to take you through 70 Q&As to your JN0-690 Exam preparation. In the JN0-690 exam resources, you will cover every field and category in JNCSP-SEC Certification helping to ready you for your successful Juniper Certification.

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  • Updated on: Aug 27, 2026
  • No. of Questions: 70 Questions & Answers

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Juniper JN0-690 Exam Syllabus Topics:

SectionWeightObjectives
Data Plane & Interfaces Troubleshooting20%- Forwarding table & packet flow analysis
- Interface configuration, status & errors
- CoS, filters & policer issues
Troubleshooting Methodology & Tools15%- Junos CLI commands & diagnostic utilities
- Systematic troubleshooting approach
- Logging, monitoring & packet capture tools
Control Plane Troubleshooting20%- Control plane protection & DDoS mitigation
- Protocol control messages & routing tables
- Routing Engine operations & health
High Availability & Network Services15%- DHCP, DNS, NTP & authentication services
- Chassis cluster & redundancy groups
- Graceful restart & non-stop routing
Chassis & Hardware Troubleshooting15%- Hardware components & status monitoring
- Power, cooling & FPC/PIC issues
- Boot process & system startup problems
Layer 2 & Layer 3 Protocol Troubleshooting15%- OSPF, BGP, IS-IS & RIP
- VRRP, BFD & high availability protocols
- Ethernet, VLAN, STP & LACP

Juniper Junos Troubleshooting Sample Questions:

Question 1

What controls the CLI process?

A. management daemon
B. device control daemon
C. chassis control daemon
D. routing protocol process


Question 2

Click the Exhibit button.
-- Exhibit --
user@R1> show configuration interfaces lo0
unit 5 {
family inet {
filter {
input JUNOS;
}
address 5.5.5.5/32;
}
}
user@R1> show configuration firewall family inet filter JUNOS
term term1 {
from {
protocol tcp;
port [ telnet ftp ftp-data snmp ssh syslog http tacacs 64644 1024-65535 ];
}
then {
log;
accept;
}
}
term default {
then {
discard;
} } -- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)

A. R1 will drop all BGP packets.
B. R1 will drop all OSPF packets.
C. R1 will drop all non-TCP transit traffic.
D. R1 will accept telnet traffic.
E. R1 will drop all traffic with destination address 5.5.5.5.


Question 3

Click the Exhibit button.
-- Exhibit -user@router> show chassis environment
Class Item Status Measurement Power Power Supply A OK Power Supply B Absent
Temp FPC 0 OK 28 degrees C / 82 degrees F FPC 1 OK 27 degrees C / 80 degrees F Power Supply A OK 22 degrees C / 71 degrees F Power Supply B Absent SSB 0 OK 30 degrees C / 86 degrees F Backplane OK 22 degrees C / 71 degrees F Routing Engine 0 OK 26 degrees C / 78 degrees F Routing Engine 1 Testing
Fans Rear Fan OK Spinning at normal speed Front Upper Fan OK Spinning at normal speed Front Middle Fan OK Spinning at normal speed Front Bottom Fan OK Spinning at normal speed
Misc Craft Interface OK -- Exhibit -
Referring to the exhibit, which two statements are true about the chassis? (Choose two.)

A. Power Supply B is installed in the system but has failed.
B. Routing Engine 1 is installed in the system but is still initializing.
C. Power Supply B is not installed in the system.
D. Routing Engine 1 has failed.


Question 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 a common, harmless syslog and can be ignored.
C. A log for rpd scheduler slip is an indication of something that should be investigated and resolved.
D. A possible method to troubleshoot rpd scheduler slips is to temporarily enable task accounting.
E. A possible cause for an overworked rpd is excessive protocol tracing.


Question 5

What is the name of the routing protocol process on a Junos OS device?

A. chassisd
B. rpd
C. snmpd
D. cosd


Solutions:

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

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