Juniper JN0-690 : Junos Troubleshooting

Exam Code: JN0-690

Exam Name: Junos Troubleshooting

Updated: Aug 28, 2026

Q & A: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

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

Juniper Junos Troubleshooting Sample Questions:

Question 1

Which CLI command is used to restart a software process?

A. reload
B. commit
C. reboot
D. restart


Question 2

You have configured graceful Routing Engine switchover (GRES) on your device running the Junos OS. Which command would you run to ensure that GRES is functioning properly?

A. Issue the show system switchover command from the backup Routing Engine.
B. Issue the show chassis routing-engine command from the backup Routing Engine.
C. Issue the show chassis routing-engine command from the master Routing Engine.
D. Issue the show system switchover command from the master Routing Engine.


Question 3

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


Question 4

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

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


Question 5

You are asked to provide an audit trail for all user activity on your Junos device.
Which syslog configuration statement accomplishes this task?

A. user * {
any any;
}
file messages {
any info;
authorization info;
}
B. user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file interactive-commands {
interactive-commands any;
}
C. user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file audit-commands {
authorization any;
}
D. user * {
any any;
}
file messages {
any notice;
authorization info;
}


Solutions:

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

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