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Juniper JN0-690 exam : Junos Troubleshooting

JN0-690 Exam Simulator
  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Oct 24, 2026
  • Q & A: 70 Questions and Answers
  • Juniper JN0-690 Q&A - in .pdf

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Juniper JN0-690 exam simulator

Juniper JN0-690 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: High Availability & Network Services15%- Chassis cluster & redundancy groups
- Graceful restart & non-stop routing
- DHCP, DNS, NTP & authentication services
Topic 2: Troubleshooting Methodology & Tools15%- Junos CLI commands & diagnostic utilities
- Logging, monitoring & packet capture tools
- Systematic troubleshooting approach
Topic 3: Control Plane Troubleshooting20%- Protocol control messages & routing tables
- Routing Engine operations & health
- Control plane protection & DDoS mitigation
Topic 4: Chassis & Hardware Troubleshooting15%- Power, cooling & FPC/PIC issues
- Boot process & system startup problems
- Hardware components & status monitoring
Topic 5: Layer 2 & Layer 3 Protocol Troubleshooting15%- VRRP, BFD & high availability protocols
- OSPF, BGP, IS-IS & RIP
- Ethernet, VLAN, STP & LACP
Topic 6: Data Plane & Interfaces Troubleshooting20%- Forwarding table & packet flow analysis
- Interface configuration, status & errors
- CoS, filters & policer issues

Juniper Junos Troubleshooting Sample Questions:

Question #1

By default, in which table are OSPF routes stored on a Junos device?

  • A. inet.2
  • B. inet.3
  • C. inet.0
  • D. inet.1
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

Question #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 task replication command on the master and the backup Routing Engines.
  • C. Use the show system synchronization command only on the master Routing Engine.
  • D. Use the show system synchronization command on the master and the backup Routing Engines.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

Question #3

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 enable nonstop active routing (NSR).
  • C. You must enable graceful Routing Engine switchover (GRES).
  • D. You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.
Reveal Solution  Discussion  0

Correct Answer: B,C  🗳️

Question #4

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. The boot failed because a USB drive has been inserted into the device.
  • B. You must swap the Routing Engine over to the backup slot to get it to boot properly.
  • C. The Routing Engine cannot mount the partition to complete booting.
  • D. The boot failed because one of the file systems is in an inconsistent state.
  • E. Running fsck on the partition might resolve the boot problem.
Reveal Solution  Discussion  0

Correct Answer: C,D,E  🗳️

Question #5

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. The static route has Next hop typE. Reject.
  • C. The export policy is incorrect.
  • D. An AS path loop is detected.
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

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