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Juniper JN0-690 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Services and Protocol Troubleshooting | - VPN and tunnel troubleshooting - NAT and firewall filter behavior |
| Topic 2: Layer 3 Routing Troubleshooting | - Static routing and route lookup issues - BGP troubleshooting - OSPF troubleshooting |
| Topic 3: Junos OS Fundamentals and Architecture | - Junos OS process architecture and components - System operation and maintenance basics |
| Topic 4: Interface and Layer 2 Troubleshooting | - Interface status and error diagnosis - VLAN and switching issues |
| Topic 5: Routing Policy and Filter Issues | - Policy application and route selection - Filter evaluation and debugging |
| Topic 6: System Monitoring and Diagnostics | - Performance and connectivity analysis tools - Logs, traces, and system alarms |
Juniper Junos Troubleshooting Sample Questions:
Which three steps are involved in troubleshooting any problem? (Choose three.)
- A. Reboot the device.
- B. Clearly define the problem.
- C. Isolate the problem.
- D. Determine who made the changes.
- E. Outline the expected behavior.
Correct Answer: B,C,E 🗳️
Which three commands will provide details about CPU utilization on a line card? (Choose three.)
- A. request pfe execute target fpc1 command "show arp"
- B. request pfe execute target fpc1 command "show thread"
- C. request pfe execute target fpc1 command "show sched"
- D. show chassis fpc
- E. show chassis hardware
Correct Answer: B,C,D 🗳️
Click the Exhibit button.
-- Exhibit -user@host> request system software add ... WARNING: The /var filesystem is low on free disk space. WARNING: This package requires 1 k free, but there WARNING: is only 666502k available. -- Exhibit -
Which three commands are useful in identifying and addressing the cause of the lack of disk space? (Choose three.)
- A. show system directory-usage
- B. show system storage
- C. show chassis routing-engine
- D. request system software add validate
- E. request system storage cleanup
Correct Answer: A,B,E 🗳️
-- Exhibit -[edit] user@R1# run show interfaces ge-1/1/2 terse Interface Admin Link Proto Local Remote ge-1/1/2 up up ge-1/1/2.0 up up aenet --> ae0.0
[edit] user@R1# run show interfaces ge-1/1/3 terse Interface Admin Link Proto Local Remote ge-1/1/3 up up ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R1# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R1# show interfaces ae0
aggregated-ether-options {
lacp {
periodic slow;
system-priority 200;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
**************************************************************************
[edit]
user@R2# run show interfaces ge-1/1/2 terse
Interface Admin Link Proto Local Remote
ge-1/1/2 up up
ge-1/1/2.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ge-1/1/3 terse
Interface Admin Link Proto Local Remote
ge-1/1/3 up up
ge-1/1/3.0 up up aenet --> ae0.0
[edit]
user@R2# run show interfaces ae0 terse
Interface Admin Link Proto Local Remote
ae0 up down
ae0.0 up down bridge
[edit]
user@R2# show interfaces ae0
aggregated-ether-options {
lacp {
periodic fast;
system-priority 100;
}
}
unit 0 {
family bridge {
interface-mode trunk;
vlan-id-list 100;
}
}
-- Exhibit --
You have configured a LAG and are now enabling LACP on the ae0 interface. You have configured and committed the configuration as shown in the exhibit. However, the exhibit also shows that the ae0 interface is now in the up/down state.
What must you do to resolve this problem?
- A. Configure both routers' ae0 LACP configuration to periodic fast.
- B. Configure R2's LACP configuration as passive.
- C. Change the LACP system-priority of R1 to 300.
- D. Configure R1's LACP configuration as active.
Correct Answer: 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.)
- A. R1 will accept telnet traffic.
- B. R1 will drop all BGP packets.
- C. R1 will drop all OSPF packets.
- D. R1 will drop all traffic with destination address 5.5.5.5.
- E. R1 will drop all non-TCP transit traffic.
Correct Answer: A,B,C 🗳️
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