Juniper JN0-690 : Junos Troubleshooting

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

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Juniper Junos Troubleshooting Sample Questions:

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


2. What controls the CLI process?

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


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


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

A) mgd
B) ppmd
C) chassisd
D) rpd


5. By default, in which table are OSPF routes stored on a Junos device?

A) inet.0
B) inet.1
C) inet.3
D) inet.2


Solutions:

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

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