JN0-690 exam dumps

Juniper JN0-690 Value Package

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  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • No. of Questions: 70 Questions and Answers
  • Updated: Aug 29, 2026

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Juniper JN0-690 Exam Syllabus Topics:

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

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


Question 2

Which three steps are involved in troubleshooting any problem? (Choose three.)

A. Outline the expected behavior.
B. Isolate the problem.
C. Determine who made the changes.
D. Clearly define the problem.
E. Reboot the device.


Question 3

Click the Exhibit button.
-- Exhibit -user@host > show chassis craft-interface
Front Panel System LEDs: Routing Engine 0 1
OK * . Fail . * Master * .
Front Panel Alarm Indicators:
Red LED .
Yellow LED *
Major relay .
Minor relay *
Front Panel FPC LEDs:
FPC 0 1 2 3 4 5 6 7 8 9
Red . . . . . . . . . . Green * * . . . . . . * * CB LEDs:
CB 0 1
Amber . . Green * *
PS LEDs: PS 0 1 2 3 4 5 6 7 8
Red . . . . . . . . . Green . . . . * * * * *
Fan Tray LEDs: FT 0 1 2 3
Red . . . . Green * * * *
Front Panel SFB LEDs: SFB 0 1 2 3 4 5 6 7
Red . . . . . . . . Green * * * * * * * *
Front Panel Chassis Info: Chassis Number 0x0 Chassis Role S
-- Exhibit -
Referring to the exhibit, which statement is true?

A. Routing Engine 1 is OK, the red LED is lit, and the minor alarm relay is on.
B. Routing Engine 1 has failed, yellow LED is lit, and the minor alarm relay is on.
C. Routing Engine 1 is OK, the red LED is lit, and the major alarm relay is on.
D. Routing Engine 1 has failed, yellow LED is lit, and the major alarm relay is on.


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. The boot failed because one of the file systems is in an inconsistent state.
C. Running fsck on the partition might resolve the boot problem.
D. You must swap the Routing Engine over to the backup slot to get it to boot properly.
E. The Routing Engine cannot mount the partition to complete booting.


Question 5

You have been asked to troubleshoot an interface that is flapping.
Which three tools would you use to isolate the cause? (Choose three.)

A. PFE statistics
B. show interfaces
C. syslog messages
D. ping utility
E. loopback interface testing


Solutions:

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

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