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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Routing Policy and Filter Issues | - Policy application and route selection - Filter evaluation and debugging |
| Topic 2: Junos OS Fundamentals and Architecture | - Junos OS process architecture and components - System operation and maintenance basics |
| Topic 3: Services and Protocol Troubleshooting | - VPN and tunnel troubleshooting - NAT and firewall filter behavior |
| Topic 4: Layer 3 Routing Troubleshooting | - BGP troubleshooting - OSPF troubleshooting - Static routing and route lookup issues |
| Topic 5: System Monitoring and Diagnostics | - Performance and connectivity analysis tools - Logs, traces, and system alarms |
| Topic 6: Interface and Layer 2 Troubleshooting | - VLAN and switching issues - Interface status and error diagnosis |
Juniper Junos Troubleshooting Sample Questions:
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. Routing Engine 1 is installed in the system but is still initializing.
- B. Routing Engine 1 has failed.
- C. Power Supply B is installed in the system but has failed.
- D. Power Supply B is not installed in the system.
Correct Answer: A,D 🗳️
-- Exhibit -
[edit]
user@router# show interfaces
ge-1/1/2 {
gigether-options {
802.3ad ae0;
}
}
ge-1/1/3 {
gigether-options {
802.3ad ae0;
}
}
ae0 {
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
}
-- Exhibit -
You are asked to configure a LAG. You configure and commit the configuration as shown in the exhibit. When verifying your ae0 interface, you encounter the following error:
[edit] user@router# run show interfaces ae0 error: device ae0 not found
Which command would you use to resolve this problem?
- A. set chassis aggregated-devices ethernet device-count 1
- B. set interfaces ae0 aggregated-ether-options lacp active
- C. set chassis alarm ethernet link-down ignore
- D. set chassis network-services ethernet
Correct Answer: A 🗳️
A technician has reported an alarm on your device running the Junos OS. You suspect it is due to the temperature in the rack. Which two commands will confirm your suspicion? (Choose two.)
- A. show chassis environment
- B. show chassis hardware
- C. show chassis alarms
- D. show chassis firmware
Correct Answer: A,C 🗳️
Which two statements are true regarding BGP path MTU discovery? (Choose two.)
- A. BGP path MTU discovery provides the most efficient use of link bandwidth.
- B. BGP path MTU discovery alleviates fragmentation problems.
- C. BGP path MTU discovery can be enabled only for IBGP sessions.
- D. BGP path MTU discovery must be configured on every router along the path.
Correct Answer: A,B 🗳️
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. Referring to the exhibit, which two statements are true? (Choose two.) The first ping fails because the do-not-fragment option is set.
- B. The first ping fails because the Junos OS takes into account the CRC header while calculating the MTU.
- C. The first ping fails because the Junos OS takes into account Layer 2 headers while calculating the MTU.
- D. The first ping fails because the Junos OS takes into account ICMP and IP headers while calculating the MTU.
Correct Answer: A,D 🗳️
