In the exhibit, the switches have all been powered on at the same time and have the factory
default RSTP configuration.
Which action would ensure that Switch A becomes the root bridge?

You are troubleshooting a spanning tree problem and must quickly determine the cumulative cost
to the root bridge.
Which CLI command should you use?

You have four interconnected switches all using default RSTP parameters. You are asked to
ensure that S1 becomes the root bridge.
Which configuration will accomplish this task?

You manage the network shown in the exhibit. All four switches have the default RSTP settings.
The elected root bridge is switch-1. You must ensure that switch-4 always prefers the connection
to switch-3 to reach the root bridge.
Which two configurations will accomplish this task? (Choose two.)
{master:0}[edit]

— Exhibit —
{master:0}
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/6.0 128:519 128:519 32768.0019e2552481 200000 FWD DESG
ge-0/0/7.0 64:520 64:520 32768.0019e2552481 20000 FWD DESG
ge-0/0/8.0 32:521 32:521 32768.0019e2552481 20000 FWD DESG
ge-0/0/9.0 32:522 32:522 32768.0019e2552481 200000 FWD DESG

ge-0/0/11.0 32:524 32:524 32768.0019e2552481 2000 FWD DESG
ge-0/0/12.0 64:525 64:525 32768.0019e2552481 2000 FWD DESG
ge-0/0/13.0 64:526 64:526 32768.0019e2552481 2000 FWD DESG
— Exhibit —
Which three statements are correct regarding the information shown in the exhibit? (Choose
three.)

— Exhibit —
{master:0}
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/1.0 142:519 142:519 0.002688027490 10000 BLK ALT (Root-Incon)
ge-0/0/2.0 142:520 142:520 4128.0019e2516580 10000 FWD DESG
ge-0/0/3.0 142:521 142:521 4128.0019e2516580 10000 FWD DESG
— Exhibit —

Referring to the exhibit, which statement is correct about the ge-0/0/1 interface?

— Exhibit —
{master:0}
user@switch> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
ge-0/0/1.0 142:519 142:519 0.002688027490 10000 FWD ROOT
ge-0/0/2.0 142:520 142:520 4128.0019e2516580 10000 FWD DESG
ge-0/0/3.0 142:521 142:521 4128.0019e2516580 10000 BLK DIS (Loop-Incon)
— Exhibit —
Referring to the exhibit, which statement is true about the ge-0/0/3 interface?

Which two statements about dynamic ARP inspection (DAI) are true? (Choose two.)

Your security department has identified an increase in IP spoofing attacks.
Which feature should you enable with DHCP snooping to prevent these attacks?

You are asked to ensure that an unauthorized switch running spanning tree cannot be added to
any edge port on your EX Series switch. The ports must discard any incoming spanning tree
packets but the interface must continue to forward traffic.
What should you do to accomplish the behavior?