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Juniper Junos Troubleshooting - JN0-690 real prep

JN0-690
  • Exam Code: JN0-690
  • Exam Name: Junos Troubleshooting
  • Updated: Jul 14, 2025
  • Q & A: 70 Questions and Answers
  • PDF Version

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  • PDF Price: $49.98
  • Juniper JN0-690 Value Pack

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Juniper Junos Troubleshooting Sample Questions:

1. Which three statements are correct about ARP related troubleshooting? (Choose three.)

A) Most devices that run the Junos OS allow you to specify a manual ARP entry.
B) The monitor traffic interface <interface-name> command can be used to watch ARP packets.
C) An individual ARP entry can be cleared using the clear arp hostname command.
D) The clear arp command also clears the IPv6 neighbor cache.
E) There are no default ARP policers on any devices running the Junos OS.


2. Click the Exhibit button.
-- Exhibit -user@R1> show configuration interfaces xe-1/1/0 {
unit 0 { family inet {
address 17.1.1.1/24;
}
family mpls;
}
}
user@R1> ping 17.1.1.2 size 1473 do-not-fragment
PING 17.1.1.2 (17.1.1.2): 1473 data bytes
ping: sendto: Message too long
ping: sendto: Message too long
ping: sendto: Message too long
user@R1> ping 17.1.1.2 logical-system R1 size 1472 do-not-fragment
PING 17.1.1.2 (17.1.1.2): 1472 data bytes
1480 bytes from 17.1.1.2: icmp_seq=0 ttl=64 time=0.933 ms
1480 bytes from 17.1.1.2: icmp_seq=1 ttl=64 time=0.838 ms
1480 bytes from 17.1.1.2: icmp_seq=2 ttl=64 time=4.688 ms
-- Exhibit --
You are using the ping command to troubleshoot a suspected MTU problem.

A) The first ping fails because the Junos OS takes into account the CRC header while calculating the MTU.
B) The first ping fails because the Junos OS takes into account ICMP and IP headers while calculating the MTU.
C) The first ping fails because the Junos OS takes into account Layer 2 headers while calculating the MTU.
D) Referring to the exhibit, which two statements are true? (Choose two.) The first ping fails because the do-not-fragment option is set.


3. Click the Exhibit button.
-- Exhibit -[edit] user@router# show interfaces
ge-1/1/2 {
vlan-tagging;
unit 100 {
vlan-id 100;
family inet {
address 192.168.0.1/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 10.10.10.1/32;
}
}
}
[edit]
user@router# show protocols ospf
area 0.0.0.0 {
interface ge-1/1/2.0 {
interface-type p2p;
metric 250;
}
interface lo0.0;
}
[edit]
user@router# run show ospf interface Interface State Area DR ID BDR ID Nbrs lo0.0 DR 0.0.0.0 10.10.10.1 0.0.0.0 0
[edit] user@router# -- Exhibit -
Referring to the exhibit, why does only the loopback interface appear in the show ospf interface output?

A) The interface-type is not configured properly on the ge-1/1/2 interface.
B) The metric configured on ge-1/1/2 is not valid.
C) The ge-1/1/2 interface is configured under the wrong OSPF area.
D) The incorrect logical unit for the ge-1/1/2 interface is configured under the OSPF hierarchy.


4. Which two statements are true about firewall filters and policers? (Choose two.)

A) If an output firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
B) If an input firewall filter is configured on the same logical interface as a policer, the policer is executed first.
C) If an input firewall filter is configured on the same logical interface as a policer, the firewall filter is executed first.
D) If an output firewall filter is configured on the same logical interface as a policer, the policer is executed first.


5. Click the Exhibit button.
-- Exhibit -user@router> show chassis environment
Class Item Status Measurement Power Power Supply A OK Power Supply B Absent
Temp FPC 0 OK 28 degrees C / 82 degrees F FPC 1 OK 27 degrees C / 80 degrees F Power Supply A OK 22 degrees C / 71 degrees F Power Supply B Absent SSB 0 OK 30 degrees C / 86 degrees F Backplane OK 22 degrees C / 71 degrees F Routing Engine 0 OK 26 degrees C / 78 degrees F Routing Engine 1 Testing
Fans Rear Fan OK Spinning at normal speed Front Upper Fan OK Spinning at normal speed Front Middle Fan OK Spinning at normal speed Front Bottom Fan OK Spinning at normal speed
Misc Craft Interface OK -- Exhibit -
Referring to the exhibit, which two statements are true about the chassis? (Choose two.)

A) Power Supply B is installed in the system but has failed.
B) Power Supply B is not installed in the system.
C) Routing Engine 1 has failed.
D) Routing Engine 1 is installed in the system but is still initializing.


Solutions:

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

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