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Juniper JN0-690 Exam Syllabus Topics:

Section	Weight	Objectives
Layer 2 & Layer 3 Protocol Troubleshooting	15%	- VRRP, BFD & high availability protocols - Ethernet, VLAN, STP & LACP - OSPF, BGP, IS-IS & RIP
Chassis & Hardware Troubleshooting	15%	- Hardware components & status monitoring - Boot process & system startup problems - Power, cooling & FPC/PIC issues
High Availability & Network Services	15%	- Chassis cluster & redundancy groups - DHCP, DNS, NTP & authentication services - Graceful restart & non-stop routing
Control Plane Troubleshooting	20%	- Protocol control messages & routing tables - Control plane protection & DDoS mitigation - Routing Engine operations & health
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 - Systematic troubleshooting approach - Junos CLI commands & diagnostic utilities

Juniper Junos Troubleshooting Sample Questions:

Question #1

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

Reveal Solution Discussion 0

Correct Answer: A 🗳️

Question #2

You are asked to provide an audit trail for all user activity on your Junos device.
Which syslog configuration statement accomplishes this task?

A. user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file interactive-commands {
interactive-commands any;
}
B. user * {
any any;
}
file messages {
any info;
authorization info;
}
C. user * {
any any;
}
file messages {
any notice;
authorization info;
}
D. user * {
any emergency;
}
file messages {
any notice;
authorization info;
}
file audit-commands {
authorization any;
}

Reveal Solution Discussion 0

Correct Answer: A 🗳️

Question #3

Which two statements are true regarding BGP path MTU discovery? (Choose two.)

A. BGP path MTU discovery alleviates fragmentation problems.
B. BGP path MTU discovery can be enabled only for IBGP sessions.
C. BGP path MTU discovery must be configured on every router along the path.
D. BGP path MTU discovery provides the most efficient use of link bandwidth.

Reveal Solution Discussion 0

Correct Answer: A,D 🗳️

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

Reveal Solution Discussion 0

Correct Answer: B,C,E 🗳️

Question #5

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.)