Juniper JN0-690 : Junos Troubleshooting

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Aug 30, 2026
  • Q & A: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Layer 2 & Layer 3 Protocol Troubleshooting15%- Ethernet, VLAN, STP & LACP
- VRRP, BFD & high availability protocols
- OSPF, BGP, IS-IS & RIP
Topic 2: Control Plane Troubleshooting20%- Routing Engine operations & health
- Control plane protection & DDoS mitigation
- Protocol control messages & routing tables
Topic 3: High Availability & Network Services15%- Graceful restart & non-stop routing
- DHCP, DNS, NTP & authentication services
- Chassis cluster & redundancy groups
Topic 4: Troubleshooting Methodology & Tools15%- Systematic troubleshooting approach
- Junos CLI commands & diagnostic utilities
- Logging, monitoring & packet capture tools
Topic 5: Data Plane & Interfaces Troubleshooting20%- Interface configuration, status & errors
- CoS, filters & policer issues
- Forwarding table & packet flow analysis
Topic 6: Chassis & Hardware Troubleshooting15%- Power, cooling & FPC/PIC issues
- Hardware components & status monitoring
- Boot process & system startup problems

Juniper Junos Troubleshooting Sample Questions:

Question 1

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

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


Question 2

Which two commands help to identify traffic drops due to oversubscription? (Choose two.)

A. show interfaces extensive
B. show interfaces queue
C. monitor interface traffic
D. monitor traffic interface


Question 3

Click the Exhibit button.
-- Exhibit -user@host > show chassis craft-interface
Front Panel System LEDs: Routing Engine 0 1
OK * . Fail . * Master * .
Front Panel Alarm Indicators:
Red LED .
Yellow LED *
Major relay .
Minor relay *
Front Panel FPC LEDs:
FPC 0 1 2 3 4 5 6 7 8 9
Red . . . . . . . . . . Green * * . . . . . . * * CB LEDs:
CB 0 1
Amber . . Green * *
PS LEDs: PS 0 1 2 3 4 5 6 7 8
Red . . . . . . . . . Green . . . . * * * * *
Fan Tray LEDs: FT 0 1 2 3
Red . . . . Green * * * *
Front Panel SFB LEDs: SFB 0 1 2 3 4 5 6 7
Red . . . . . . . . Green * * * * * * * *
Front Panel Chassis Info: Chassis Number 0x0 Chassis Role S
-- Exhibit -
Referring to the exhibit, which statement is true?

A. Routing Engine 1 is OK, the red LED is lit, and the minor alarm relay is on.
B. Routing Engine 1 has failed, yellow LED is lit, and the major alarm relay is on.
C. Routing Engine 1 is OK, the red LED is lit, and the major alarm relay is on.
D. Routing Engine 1 has failed, yellow LED is lit, and the minor alarm relay is on.


Question 4

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


Question 5

Given the example shown below:
Emergency boot media > flash disk > _____
What is missing from the default boot list?

A. USB
B. hard disk
C. LAN
D. PCMCIA card


Solutions:

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

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