Xiao Zhang is a network administrator of a hotel. One day he found that the hotel visitors could not access the network normally. After checking, he found that the visitor’s device got the wrong IP address. In order to prevent this kind of attack, which of the following technology should be used in the network?

 Xiao Zhang is a network administrator of a hotel. One day he found that the hotel visitors could not access the network normally. After checking, he found that the visitor’s device got the wrong IP address. In order to prevent this kind of attack, which of the following technology should be used in the network?
A . DHCP Snooping
B .  Dynamic ARP inspection (DAI)
C . IP source protection (IPSG)
D . MAC authentication

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Answer: A