Juniper Junos Troubleshooting : JN0-690

JN0-690 real exams

Exam Code: JN0-690

Exam Name: Junos Troubleshooting

Updated: Aug 31, 2026

Q & A: 70 Questions and Answers

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Juniper JN0-690 Exam Syllabus Topics:

SectionObjectives
Topic 1: Troubleshooting Methodology and Tools- Junos operational commands (ping, traceroute, monitor traffic)
  • 1. Using CLI troubleshooting utilities
    • 2. Interpreting system logs and alarms
      Topic 2: Routing Policy and Firewall Filters- Policy evaluation and debugging
      • 1. Route acceptance and rejection behavior
        • 2. Firewall filter troubleshooting
          Topic 3: Layer 2 and Switching Troubleshooting- VLAN and bridging issues
          • 1. STP and switching loops
            • 2. MAC address learning and forwarding issues
              Topic 4: System Operations and Device Health- Chassis and hardware status
              • 1. Resource utilization and system performance
                • 2. Interface errors and statistics analysis
                  Topic 5: Layer 3 Routing Troubleshooting- BGP troubleshooting
                  • 1. Route advertisement and filtering problems
                    • 2. Session establishment and policy issues
                      - OSPF and IS-IS troubleshooting
                      • 1. Route calculation and convergence problems
                        • 2. Adjacency and neighbor formation issues
                          Topic 6: VPN and Service Troubleshooting- IPsec VPN issues
                          • 1. Tunnel establishment failures
                            • 2. Encryption and negotiation problems

                              Juniper Junos Troubleshooting Sample Questions:

                              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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