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Exam Code: JN0-690
Exam Name: Junos Troubleshooting
Updated: Aug 31, 2026
Q & A: 70 Questions and Answers
JN0-690 Free Demo download
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| Section | Objectives |
|---|---|
| Topic 1: Troubleshooting Methodology and Tools | - Junos operational commands (ping, traceroute, monitor traffic)
|
| Topic 2: Routing Policy and Firewall Filters | - Policy evaluation and debugging
|
| Topic 3: Layer 2 and Switching Troubleshooting | - VLAN and bridging issues
|
| Topic 4: System Operations and Device Health | - Chassis and hardware status
|
| Topic 5: Layer 3 Routing Troubleshooting | - BGP troubleshooting
|
| Topic 6: VPN and Service Troubleshooting | - IPsec VPN issues
|
Question 1
You have been asked to troubleshoot an interface that is flapping.
Which three tools would you use to isolate the cause? (Choose three.)
A. ping utility
B. show interfaces
C. syslog messages
D. PFE statistics
E. loopback interface testing
Question 2
Which three steps are involved in troubleshooting any problem? (Choose three.)
A. Determine who made the changes.
B. Reboot the device.
C. Isolate the problem.
D. Clearly define the problem.
E. Outline the expected behavior.
Question 3
Using Virtual Router Redundancy Protocol (VRRP), you want to statically force the priorities of the master and backup routers. Which priority would you set on the master router?
A. 0
B. 1
C. 128
D. 254
Question 4
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 disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.
C. You must enable nonstop active routing (NSR).
D. You must enable graceful Routing Engine switchover (GRES).
Question 5
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 0 has a missing CPU.
B. The Flexible PIC Concentrator (FPC) in slot 1 is not installed properly for this chassis.
C. The card in slot 3 is not supported by the chassis.
D. The Flexible PIC Concentrator (FPC) in slot 6 is online and working.
E. The Control Board in slot 6 is online and working.
Solutions:
| Question 1 Answer: B,C,E | Question 2 Answer: C,D,E | Question 3 Answer: D | Question 4 Answer: C,D | Question 5 Answer: B,C,D |
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