Juniper JN0-690 : Junos Troubleshooting

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Sep 07, 2025
  • Q & A: 70 Questions and Answers

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Juniper Junos Troubleshooting Sample Questions:

1. -- Exhibit -
[edit]
user@router# show interfaces
ge-1/1/2 {
gigether-options {
802.3ad ae0;
}
}
ge-1/1/3 {
gigether-options {
802.3ad ae0;
}
}
ae0 {
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
}
-- Exhibit -
You are asked to configure a LAG. You configure and commit the configuration as shown in the exhibit. When verifying your ae0 interface, you encounter the following error:
[edit] user@router# run show interfaces ae0 error: device ae0 not found
Which command would you use to resolve this problem?

A) set chassis network-services ethernet
B) set interfaces ae0 aggregated-ether-options lacp active
C) set chassis alarm ethernet link-down ignore
D) set chassis aggregated-devices ethernet device-count 1


2. Click the Exhibit button.
-- Exhibit -user@router> show system processes extensive last piD. 4160; load averages: 0.13, 0.08, 0.07 up 2+02:47:50 21:13:39 120 processes: 17 running, 90 sleeping, 1 zombie, 12 waiting
Mem: 141M Active, 96M Inact, 517M Wired, 160M Cache, 112M Buf, 55M Free Swap:
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 1271 root 7 76 0 514M 63724K select 0 157.9H 280.42% flowd_octeon_hm 22 root 1 171 52 0K 16K RUN 0 43.3H 83.45% idlE. cpu0 4158 lab 1 78 0 49192K 16440K select 0 0:00 2.25% cli 1255 root 1 76 0 114M 17604K select 0 41:47 0.00% chassisd 24 root 1 -20 -139 0K 16K WAIT 0 18:50 0.00% swi7: clock 1293 root 1 76 0 12476K 6484K select 0 9:25 0.00% license-check 4159 root 1 76 0 38608K 5720K select 0 0:00 0.00% mgd
... 36 root 1 8 0 0K 16K usbevt 0 0:00 0.00% usb1 33 root 1 8 0 0K 16K usbevt 0 0:00 0.00% usb0 4160 root 1 77 0 24260K 1816K CPU0 0 0:00 0.00% top 1176 root 1 -8 0 0K 16K mdwait 0 0:00 0.00% md2 7 root 1 8 0 0K 16K - 0 0:00 0.00% thread taskq 1186 root 1 -8 0 0K 16K mdwait 0 0:00 0.00% md3 0 root 1 -8 0 0K 0K WAIT 0 0:00 0.00% swapper
-- Exhibit -
Referring to the exhibit, which Junos OS process was the last one to start?

A) cli
B) flowd_octeon_hm
C) top
D) swapper


3. Which command is useful in testing the correct operation of an SNMP configuration toward an NMS?

A) show snmp mib
B) request snmp spoof-trap
C) show snmp rmon
D) show snmp v3


4. Which three statements are true about performing an ISSU on a Junos device? (Choose three.)

A) Every PFE on each FPC downloads the new software from the backup RE.
B) Any unsupported PICs will cause the ISSU process to fail with "Error: incompatible hardware detected."
C) ksyncd synchronizes the kernel on the backup RE with the master RE.
D) The master RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
E) The backup RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.


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

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


Solutions:

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

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