Juniper JN0-690 Q&A - in .pdf

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Aug 25, 2026
  • Q & A: 70 Questions and Answers
  • PDF Price: $49.98
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Juniper JN0-690 Q&A - Testing Engine

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Aug 25, 2026
  • Q & A: 70 Questions and Answers
  • Install on multiple computers for self-paced, at-your-convenience training.
  • PC Test Engine Price: $49.98
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Juniper JN0-690 Exam Syllabus Topics:
SectionObjectives
Topic 1: System Monitoring and Diagnostics- Logs, traces, and system alarms
- Performance and connectivity analysis tools
Topic 2: Layer 3 Routing Troubleshooting- Static routing and route lookup issues
- BGP troubleshooting
- OSPF troubleshooting
Topic 3: Junos OS Fundamentals and Architecture- Junos OS process architecture and components
- System operation and maintenance basics
Topic 4: Services and Protocol Troubleshooting- VPN and tunnel troubleshooting
- NAT and firewall filter behavior
Topic 5: Interface and Layer 2 Troubleshooting- Interface status and error diagnosis
- VLAN and switching issues
Topic 6: Routing Policy and Filter Issues- Policy application and route selection
- Filter evaluation and debugging
Juniper Junos Troubleshooting Sample Questions:

Question 1

Which two actions are required when performing a unified in-service software upgrade (ISSU)? (Choose two.)

A. You must disable graceful Routing Engine switchover (GRES) if the Layer 2 Control Protocol is in use.
B. You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.
C. You must enable graceful Routing Engine switchover (GRES).
D. You must enable nonstop active routing (NSR).


Question 2

You are asked to configure traceoptions to capture all general events for rpd.
Which configuration statement accomplishes this task?

A. [edit routing-options]
user@router# show
traceoptions {
file rpd_log;
flag general;
}
B. [edit routing-instances]
user@router# show
traceoptions {
file rpd_log;
flag general;
}
C. [edit protocols]
user@router# show
traceoptions {
file rpd_log;
flag general;
}
D. [edit forwarding-options]
user@router# show
traceoptions {
file rpd_log;
flag general;
}


Question 3

Which three commands will provide details about CPU utilization on a line card? (Choose three.)

A. show chassis hardware
B. request pfe execute target fpc1 command "show thread"
C. show chassis fpc
D. request pfe execute target fpc1 command "show arp"
E. request pfe execute target fpc1 command "show sched"


Question 4

Which two tools will help determine the path of a routing loop? (Choose two.)

A. SNMP
B. traceroute
C. routing table data
D. traceoptions


Question 5

Click the Exhibit button.
-- Exhibit -[edit] user@router# show interfaces
ge-1/1/2 {
vlan-tagging;
unit 100 {
vlan-id 100;
family inet {
address 192.168.0.1/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.10.10.1/32;
}
}
}
[edit]
user@router# show protocols ospf
area 0.0.0.0 {
interface ge-1/1/2.0 {
interface-type p2p;
metric 250;
}
interface lo0.0;
}
[edit]
user@router# run show ospf interface Interface State Area DR ID BDR ID Nbrs lo0.0 DR 0.0.0.0 10.10.10.1 0.0.0.0 0
[edit] user@router# -- Exhibit -
Referring to the exhibit, why does only the loopback interface appear in the show ospf interface output?

A. The incorrect logical unit for the ge-1/1/2 interface is configured under the OSPF hierarchy.
B. The interface-type is not configured properly on the ge-1/1/2 interface.
C. The ge-1/1/2 interface is configured under the wrong OSPF area.
D. The metric configured on ge-1/1/2 is not valid.


Solutions:

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

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