Which of the following is enabled by default on an EX Series switch?

A.
MAC move limiting

B.
storm control

C.
IP source guard

D.
dynamic ARP inspection

Explanation:
The default configuration of storm control differs according to the switch line:

On EX2200, EX3200, EX3300, EX4200, and EX6200 access portsStorm control does not apply to multicast traffic by default. The factory default configuration enables storm control for broadcast and unknown unicast traffic on all switch interfaces, with the storm control level set to 80 percent of the combined broadcast and unknown unicast streams.

On EX4500 and EX8200 switchesThe factory default configuration enables storm control on all switch interfaces, with the storm control level set to 80 percent of the combined broadcast, multicast, and unknown unicast streams.