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Juniper Junos Troubleshooting Sample Questions:

1. 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 boot failed because a USB drive has been inserted into the device.
C) The boot failed because one of the file systems is in an inconsistent state.
D) The Routing Engine cannot mount the partition to complete booting.
E) Running fsck on the partition might resolve the boot problem.

2. Which statement is correct about troubleshooting?

A) Establishing a network baseline is important to help understand when something is not working.
B) You must always have a complete understanding of the problem before you begin gathering any information.
C) You must be sure the problem will be resolved before attempting a potential solution.
D) The problem must be reproducible before attempting a potential solution.

3. Click the Exhibit button.
-- Exhibit -user@R1> show route forwarding-table destination 2.2.2.2
user@R1> show route 2.2.2.2
inet.0: 10 destinations, 10 routes (10 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
2.2.2.2/32 *[OSPF/10] 2w3d 22:19:41, metric 1 > to 17.1.1.2 via xe-1/1/0.0
-- Exhibit -
Referring to the exhibit, which statement is true about transit traffic sent to 2.2.2.2?

A) R1 will redirect the packet to the Routing Engine.
B) R1 will discard the packet.
C) R1 will reject the packet.
D) R1 will forward the packet.

4. Click the Exhibit button.
-- Exhibit -user@R1> show route 2.2.2.2
user@R1> show route forwarding-table destination 2.2.2.2
Routing table: default.inet Internet: Destination Type RtRef Next hop Type Index NhRef Netif 2.2.2.2/32 user 1 17.1.1.2 ucst 642 9 xe-1/1/0.0
-- Exhibit -
Referring to the exhibit, which statement is true about transit traffic sent to 2.2.2.2?

A) R1 will redirect the packet to the Routing Engine.
B) R1 will discard the packet.
C) R1 will reject the packet.
D) R1 will forward the packet.

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

Solutions: