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Juniper JN0-690 Exam Syllabus Topics:

Juniper Junos Troubleshooting Sample Questions:

1. You have been asked to troubleshoot an interface that is flapping.
Which three tools would you use to isolate the cause? (Choose three.)

A) PFE statistics
B) show interfaces
C) syslog messages
D) loopback interface testing
E) ping utility

2. Which three statements are true about performing an ISSU on a Junos device? (Choose three.)

A) The master RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.
B) ksyncd synchronizes the kernel on the backup RE with the master RE.
C) Any unsupported PICs will cause the ISSU process to fail with "Error: incompatible hardware detected."
D) Every PFE on each FPC downloads the new software from the backup RE.
E) The backup RE verifies disk space on both REs, unsupported configurations, and unsupported PICs.

3. -- 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) Change the LACP system-priority of R1 to 300.
B) Configure both routers' ae0 LACP configuration to periodic fast.
C) Configure R1's LACP configuration as active.
D) Configure R2's LACP configuration as passive.

4. Which two features would be deployed to prevent DoS attacks? (Choose two.)

A) Bidirectional Forward Detection (BFD)
B) periodic packet management (PPM)
C) loopback filter
D) ARP policer

5. You want to reset all the PFE components with graceful Routing Engine switchover (GRES) disabled on the system. Which command should you use?

A) restart chassis-control soft
B) restart chassis-control
C) restart chassis-control immediately
D) restart routing

Solutions: