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Juniper JN0-690 - Junos Troubleshooting
Updated: Oct 13, 2026
Q & A: 70 Questions and Answers
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Updated: Oct 13, 2026
Q & A: 70 Questions and Answers
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| Section | Weight | Objectives |
|---|---|---|
| Layer 2 & Layer 3 Protocol Troubleshooting | 15% | - OSPF, BGP, IS-IS & RIP - Ethernet, VLAN, STP & LACP - VRRP, BFD & high availability protocols |
| Chassis & Hardware Troubleshooting | 15% | - Power, cooling & FPC/PIC issues - Boot process & system startup problems - Hardware components & status monitoring |
| Control Plane Troubleshooting | 20% | - Protocol control messages & routing tables - Routing Engine operations & health - Control plane protection & DDoS mitigation |
| High Availability & Network Services | 15% | - Graceful restart & non-stop routing - DHCP, DNS, NTP & authentication services - Chassis cluster & redundancy groups |
| Data Plane & Interfaces Troubleshooting | 20% | - Forwarding table & packet flow analysis - Interface configuration, status & errors - CoS, filters & policer issues |
| Troubleshooting Methodology & Tools | 15% | - Logging, monitoring & packet capture tools - Junos CLI commands & diagnostic utilities - Systematic troubleshooting approach |
Which three steps are involved in troubleshooting any problem? (Choose three.)
Correct Answer: A,D,E 🗳️
Which command would be helpful in determining the time at which the protocols started?
Correct Answer: B 🗳️
Click the Exhibit button.
-- Exhibit -user@router> show system users
9:28PM up 2 days, 3:02, 2 users, load averages: 0.06, 0.13, 0.09 USER TTY FROM LOGIN@ IDLE WHAT lab u0 -9:13PM - -cli (cli) admin p0 10.210.15.30 9:45PM - -cli (cli) -- Exhibit -
Referring to the exhibit, which two statements are true? (Choose two.)
Correct Answer: B,C 🗳️
Which two statements are true regarding BGP path MTU discovery? (Choose two.)
Correct Answer: A,D 🗳️
Click the Exhibit button.
-- Exhibit --
user@R1> show configuration interfaces lo0
unit 5 {
family inet {
filter {
input JUNOS;
}
address 5.5.5.5/32;
}
}
user@R1> show configuration firewall family inet filter JUNOS
term term1 {
from {
protocol tcp;
port [ telnet ftp ftp-data snmp ssh syslog http tacacs 64644 1024-65535 ];
}
then {
log;
accept;
}
}
term default {
then {
discard;
} } -- Exhibit -
Referring to the exhibit, which three statements are true? (Choose three.)
Correct Answer: A,D,E 🗳️
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