Which switch feature determines validity based on IP-to-MAC address bindings that are stored in a trusted database?

Which switch feature determines validity based on IP-to-MAC address bindings that are stored in a trusted database?
A . Dynamic ARP Inspection
B . storm control
C . VTP pruning
D . DHCP snooping

Answer: A

Explanation:

Dynamic ARP inspection determines the validity of an ARP packet based on valid IP-to-MAC address bindings stored in a trusted database, the DHCP snooping binding database. This database is built by DHCP snooping if DHCP snooping is enabled on the VLANs and on the switch. If the ARP packet is received on a trusted interface, the switch forwards the packet without any checks. On untrusted interfaces, the switch forwards the packet only if it is valid. Reference: http:// www.cisco.com/c/en/us/ support/docs/switches/catalyst-3750-series- switches/72846-layer2-secftrs-catl3fixed.html