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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Layer 3 Routing Troubleshooting | - BGP troubleshooting - Static routing and route lookup issues - OSPF troubleshooting |
| Topic 2: Junos OS Fundamentals and Architecture | - System operation and maintenance basics - Junos OS process architecture and components |
| Topic 3: System Monitoring and Diagnostics | - Logs, traces, and system alarms - Performance and connectivity analysis tools |
| Topic 4: Services and Protocol Troubleshooting | - NAT and firewall filter behavior - VPN and tunnel troubleshooting |
| Topic 5: Interface and Layer 2 Troubleshooting | - Interface status and error diagnosis - VLAN and switching issues |
| Topic 6: Routing Policy and Filter Issues | - Filter evaluation and debugging - Policy application and route selection |
Juniper Junos Troubleshooting Sample Questions:
Which command would be used to clear stuck user sessions?
- A. request system reboot
- B. request system logout
- C. request routing-engine login other-routing-engine
- D. request chassis routing-engine master switch
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 Routing Engine models are different between the master and backup.
- 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 master Routing Engine cannot communicate with the backup Routing Engine.
- D. The synchronization failed because the Junos OS version on the backup does not support GRES.
Correct Answer: B 🗳️
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 firmware
- D. show chassis alarms
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 🗳️
Click the Exhibit button.
-- Exhibit -user@R1> show pfe statistics traffic Packet Forwarding Engine traffic statistics:
Input packets: 47593914461368 2 pps Output packets: 28805646 3 pps Packet Forwarding Engine local traffic statistics: Local packets input : 36278104324
Local packets output : 2
Software input control plane drops : 0
Software input high drops : 0
Software input medium drops : 0
Software input low drops : 0
Software output drops : 0
Hardware input drops : 191367536738 Packet Forwarding Engine local protocol statistics:
HDLC keepalives : 0
ATM OAM : 0
Frame Relay LMI : 0
PPP LCP/NCP : 0
OSPF hello : 3883169
OSPF3 hello : 0
RSVP hello : 1440704
LDP hello : 4782297
BFD : 0
IS-IS IIH : 0
LACP : 0
ARP : 765512
ETHER OAM : 0
Unknown : 1897610 Packet Forwarding Engine hardware discard statistics:
Timeout : 0
Truncated key : 0
Bits to test : 0
Data error : 0 Stack underflow : 0 Stack overflow : 0 Normal discard : 191367536738 Extended discard : 0 Invalid interface : 0 Info cell drops : 191367536738 Fabric drops : 191367536738
Packet Forwarding Engine Input IPv4 Header Checksum Error and Output MTU Error statistics: Input Checksum : 0 Output MTU : 0
-- Exhibit -
Referring to the exhibit, which counter indicates a possible denial of service attack?
- A. fabric drops
- B. normal discard
- C. hardware input drops
- D. info cell drops
Correct Answer: C 🗳️
