Juniper JN0-690 : Junos Troubleshooting

JN0-690 real exams

Exam Code: JN0-690

Exam Name: Junos Troubleshooting

Updated: Sep 06, 2026

Q & A: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

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

Juniper Junos Troubleshooting Sample Questions:

Question #1

Click the Exhibit button.
-- Exhibit -user@R1> show route forwarding-table destination 2.2.2.2
user@R1> show route 2.2.2.2
inet.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2.2.2.2/32 *[OSPF/10] 2w3d 22:19:41, metric 1 > to 17.1.1.2 via xe-1/1/0.0
-- Exhibit -
Referring to the exhibit, which statement is true about transit traffic sent to 2.2.2.2?

  • A. R1 will forward the packet.
  • B. R1 will reject the packet.
  • C. R1 will discard the packet.
  • D. R1 will redirect the packet to the Routing Engine.
Answer: C
Question #2

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

  • A. monitor interface traffic
  • B. monitor traffic interface
  • C. show interfaces extensive
  • D. show interfaces queue
Answer: C,D
Question #3

In Junos, which process has its own internal task scheduler?

  • A. chassisd
  • B. mgd
  • C. ppmd
  • D. rpd
Answer: D
Question #4

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

  • A. chassisd
  • B. snmpd
  • C. cosd
  • D. rpd
Answer: D

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Question #5

Which two Junos OS commands are helpful in confirming whether an Object Identifier (OID) has recorded the correct data? (Choose two.)

  • A. show snmp mib walk
  • B. show snmp mib get
  • C. show snmp v3
  • D. show snmp statistics
Answer: A,B

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