Juniper JN0-690 exam dumps : Junos Troubleshooting

  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Oct 22, 2026     Q & A: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

SectionObjectives
Services and Protocol Troubleshooting- NAT and firewall filter behavior
- VPN and tunnel troubleshooting
Interface and Layer 2 Troubleshooting- VLAN and switching issues
- Interface status and error diagnosis
Layer 3 Routing Troubleshooting- BGP troubleshooting
- OSPF troubleshooting
- Static routing and route lookup issues
Junos OS Fundamentals and Architecture- Junos OS process architecture and components
- System operation and maintenance basics
System Monitoring and Diagnostics- Logs, traces, and system alarms
- Performance and connectivity analysis tools
Routing Policy and Filter Issues- Filter evaluation and debugging
- Policy application and route selection

Juniper Junos Troubleshooting Sample Questions:

Question #1

Click the Exhibit button.

You recently added an EBGP neighbor to R1 and you are receiving a single BGP route for their internal network. You notice that on R2 the route learned from C1 is being marked as hidden because the next hop is unusable.
Referring to the exhibit, what should you do to resolve the problem?

  • A. Create a next-hop-self import policy and apply this policy to IBGP.
  • B. Create a next-hop-self import policy on R1 and apply this policy to EBGP.
  • C. Create a next-hop-self import policy on R2 and apply this policy to IBGP.
  • D. Create a next-hop-self export policy on R1 and apply this policy to IBGP.
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #2

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 accept telnet traffic.
  • B. R1 will drop all traffic with destination address 5.5.5.5.
  • C. R1 will drop all non-TCP transit traffic.
  • D. R1 will drop all BGP packets.
  • E. R1 will drop all OSPF packets.
Reveal Solution  Discussion  0

Correct Answer: A,D,E  🗳️

Question #3

Which CLI command is used to restart a software process?

  • A. reload
  • B. restart
  • C. commit
  • D. reboot
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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Question #4

Click the Exhibit button.
-- Exhibit -
Slot 0 information: State Online Total CPU DRAM ---- CPU less FPC ---Start time 2012-07-07 03:21:00 UTC Uptime 27 minutes, 51 seconds Slot 1 information: State Present Reason --- Hardware Not In Right Slot --Slot 2 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:20:59 UTC Uptime 27 minutes, 52 seconds Slot 3 information: State Present Reason --- Hardware Not Supported --Total CPU DRAM 0 MB Slot 6 information: State Online Total CPU DRAM 32 MB Start time 2012-07-07 03:21:01 UTC Uptime 27 minutes, 50 seconds
-- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)

  • A. The Control Board in slot 6 is online and working.
  • B. The card in slot 3 is not supported by the chassis.
  • C. The Control Board in slot 0 has a missing CPU.
  • D. The Flexible PIC Concentrator (FPC) in slot 6 is online and working.
  • E. The Flexible PIC Concentrator (FPC) in slot 1 is not installed properly for this chassis.
Reveal Solution  Discussion  0

Correct Answer: B,D,E  🗳️

Question #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 io-statistics
  • B. show ospf log
  • C. show ospf route
  • D. show ospf statistics
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

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