Juniper JN0-690 : Junos Troubleshooting

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Jun 02, 2026
  • Q & A: 70 Questions and Answers

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Juniper Junos Troubleshooting Sample Questions:

1. A client has reported that they cannot establish an FTP connection to your Junos device.
Which command would you use to diagnose the problem?

A) monitor traffic interface
B) show interfaces extensive
C) show interfaces terse
D) monitor interface traffic


2. You have configured and successfully committed the configuration for nonstop active routing (NSR). Which command would you use to determine if NSR is operating correctly?

A) Use the show task replication command only on the master Routing Engine.
B) Use the show system synchronization command only on the master Routing Engine.
C) Use the show task replication command on the master and the backup Routing Engines.
D) Use the show system synchronization command on the master and the backup Routing Engines.


3. Click the Exhibit button.
-- Exhibit -=================== Bootstrap installer starting =================== Initialized the environment Routing engine model is RE-S-1800x4 Discovered that flash disk = ad0 , hard disk = ad1 mount: /dev/ad1s1f : Invalid argument ERROR: mount_partition: Mount /dev/ad1s1a /mnt failed You are now in a debugging subshell (you may not see a prompt)... # -- Exhibit -
During the boot of your MX480, you see the output shown in the exhibit. Which three statements are true? (Choose three.)

A) Running fsck on the partition might resolve the boot problem.
B) The Routing Engine cannot mount the partition to complete booting.
C) You must swap the Routing Engine over to the backup slot to get it to boot properly.
D) The boot failed because one of the file systems is in an inconsistent state.
E) The boot failed because a USB drive has been inserted into the device.


4. Click the Exhibit button.
-- Exhibit --
user@R1> show configuration interfaces lo0
unit 5 {
family inet {
filter {
input JUNOS;
}
address 5.5.5.5/32;
}
}
user@R1> show configuration firewall family inet filter JUNOS
term term1 {
from {
protocol tcp;
port [ telnet ftp ftp-data snmp ssh syslog http tacacs 64644 1024-65535 ];
}
then {
log;
accept;
}
}
term default {
then {
discard;
} } -- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)

A) R1 will drop all OSPF packets.
B) R1 will drop all BGP packets.
C) R1 will drop all traffic with destination address 5.5.5.5.
D) R1 will drop all non-TCP transit traffic.
E) R1 will accept telnet traffic.


5. 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 log
B) show ospf statistics
C) show ospf route
D) show ospf io-statistics


Solutions:

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

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