Juniper JN0-690 : Junos Troubleshooting
- Exam Code: JN0-690
- Exam Name: Junos Troubleshooting
- Updated: Oct 10, 2026
- Q & A: 70 Questions and Answers
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Juniper JN0-690 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Control Plane Troubleshooting | 20% | - Control plane protection & DDoS mitigation - Protocol control messages & routing tables - Routing Engine operations & health |
| Topic 2: Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - VRRP, BFD & high availability protocols - Ethernet, VLAN, STP & LACP |
| Topic 3: Data Plane & Interfaces Troubleshooting | 20% | - Forwarding table & packet flow analysis - Interface configuration, status & errors - CoS, filters & policer issues |
| Topic 4: Troubleshooting Methodology & Tools | 15% | - Junos CLI commands & diagnostic utilities - Logging, monitoring & packet capture tools - Systematic troubleshooting approach |
| Topic 5: Chassis & Hardware Troubleshooting | 15% | - Boot process & system startup problems - Hardware components & status monitoring - Power, cooling & FPC/PIC issues |
| Topic 6: High Availability & Network Services | 15% | - Graceful restart & non-stop routing - Chassis cluster & redundancy groups - DHCP, DNS, NTP & authentication services |
Juniper Junos Troubleshooting Sample Questions:
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 system synchronization command only on the master Routing Engine.
- C. Use the show task replication command on the master and the backup Routing Engines.
- D. Use the show system synchronization command on the master and the backup Routing Engines.
Correct Answer: C 🗳️
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. Running fsck on the partition might resolve the boot problem.
- B. The Routing Engine cannot mount the partition to complete booting.
- C. You must swap the Routing Engine over to the backup slot to get it to boot properly.
- D. The boot failed because one of the file systems is in an inconsistent state.
- E. The boot failed because a USB drive has been inserted into the device.
Correct Answer: A,B,D 🗳️
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 is incorrect.
- B. An AS path loop is detected.
- C. The export policy should be applied under the [edit protocols bgp group ibgp neighbor 10.1.2.1] hierarchy.
- D. The static route has Next hop typE. Reject.
Correct Answer: B 🗳️
-- Exhibit -
user@router> show system switchover
Graceful switchover: On
Configuration databasE. Ready
Kernel databasE. Version incompatible
Peer statE. Steady State
-- Exhibit -
You have enabled graceful Routing Engine switchover (GRES). During verification, you switched mastership and all interfaces went down.
Referring to the output shown in the exhibit, why did the interfaces go down?
- A. The synchronization failed because the master Routing Engine cannot communicate with the backup Routing Engine.
- B. The synchronization failed because the Junos OS version on the backup is incompatible with the version running on the master.
- C. The synchronization failed because the Junos OS version on the backup does not support GRES.
- D. The synchronization failed because the Routing Engine models are different between the master and backup.
Correct Answer: B 🗳️
Which two commands help to identify traffic drops due to oversubscription? (Choose two.)
- A. show interfaces queue
- B. monitor traffic interface
- C. show interfaces extensive
- D. monitor interface traffic
Correct Answer: A,C 🗳️
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