Juniper Junos Troubleshooting : JN0-690

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: May 28, 2026     Q & A: 70 Questions and Answers

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Juniper Junos Troubleshooting Sample Questions:

1. Two neighboring routers running OSPF were configured with the same router ID by mistake.
Which OSPF operational mode command would report the number of hello packets received with the local router's router ID?

A) show ospf statistics
B) show ospf route
C) show ospf log
D) show ospf io-statistics


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) swapper
B) top
C) cli
D) flowd_octeon_hm


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

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


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

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


5. An interface on your Junos device reports a device-level flag of Loopback-detected.
What is causing this flag to be reported?

A) The interface link layer received its own frames.
B) The link-layer protocol failed to successfully connect with the remote endpoint.
C) The interface was administratively disabled.
D) The interface is in promiscuous mode and sees frames addressed to all physical addresses on the medium.


Solutions:

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

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