Juniper JN0-690 : Junos Troubleshooting

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

                              Juniper Junos Troubleshooting Sample Questions:

                              Question 1

                              Click the Exhibit button.
                              -- Exhibit -user@r2# run show route 100.1.1.0/24 detail
                              inet.0: 5 destinations, 5 routes (5 active, 0 holddown, 0 hidden)
                              100.1.1.0/24 (1 entry, 1 announced) *Static PreferencE. 5 Next hop typE. Reject Address: 0x8f7b5a4 Next-hop reference count: 2 StatE. Local AS: 65001 AgE. 59 Task: RT Announcement bits (1): 2-KRT AS path: 65005 I
                              user@r2# show protocols bgp
                              group ibgp { type external; export to-bgp; neighbor 10.1.2.1 { local-address 10.1.2.2; family inet { unicast; } family inet6 { unicast; } peer-as 65005; }
                              }
                              user@r2# run show bgp summary Groups: 1 Peers: 1 Down peers: 0 Table Tot Paths Act Paths Suppressed History Damp State Pending inet6.0
                              0 0 0 0 0 0 inet.0 0 0 0 0 0 0 Peer AS InPkt OutPkt OutQ Flaps Last Up/Dwn State|#Active/Received/Accepted/Damped...
                              10.1.2.1 65005 31 31 0 0 12:08 Establ inet6.0: 0/0/0/0 inet.0: 0/0/0/
                              user@r2# show policy-options
                              policy-statement to-bgp { from protocol static; then accept;
                              }
                              user@r2# run show route advertising-protocol bgp 10.1.2.1
                              [edit] user@r2# -- Exhibit -
                              Referring to the exhibit, router r2 does not advertise the static route to peer 10.1.2.1. What is the problem?

                              A. The export policy should be applied under the [edit protocols bgp group ibgp neighbor 10.1.2.1] hierarchy.
                              B. An AS path loop is detected.
                              C. The static route has Next hop typE. Reject.
                              D. The export policy is incorrect.


                              Question 2

                              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 3

                              Which two statements are true regarding BGP path MTU discovery? (Choose two.)

                              A. BGP path MTU discovery must be configured on every router along the path.
                              B. BGP path MTU discovery alleviates fragmentation problems.
                              C. BGP path MTU discovery provides the most efficient use of link bandwidth.
                              D. BGP path MTU discovery can be enabled only for IBGP sessions.


                              Question 4

                              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 terse
                              C. monitor interface traffic
                              D. show interfaces extensive


                              Question 5

                              Given the example shown below:
                              Emergency boot media > flash disk > _____
                              What is missing from the default boot list?

                              A. PCMCIA card
                              B. hard disk
                              C. USB
                              D. LAN


                              Solutions:

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

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