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Juniper Junos Troubleshooting Sample Questions:

1. In the Junos OS, which type of file dumps the program's environment in the form of memory pointers, instructions, and register data to a file in the event of a panic or other serious malfunction?

A) core file
B) configuration file
C) backup file
D) log file

2. Which two actions are required when performing a unified in-service software upgrade (ISSU)? (Choose two.)

A) You must disable graceful Routing Engine switchover (GRES) if the Layer 2 Control Protocol is in use.
B) You must enable graceful Routing Engine switchover (GRES).
C) You must enable nonstop active routing (NSR).
D) You must disable nonstop bridging (NSB) if the Layer 2 Control Protocol is in use.

3. Which CLI command applies the candidate configuration to the active configuration?

A) copy run start
B) load
C) commit
D) merge

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

5. Which three statements are correct about ARP related troubleshooting? (Choose three.)

A) Most devices that run the Junos OS allow you to specify a manual ARP entry.
B) An individual ARP entry can be cleared using the clear arp hostname command.
C) The clear arp command also clears the IPv6 neighbor cache.
D) The monitor traffic interface <interface-name> command can be used to watch ARP packets.
E) There are no default ARP policers on any devices running the Junos OS.

Solutions: