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Why is DHCP snooping essential?
It prevents ARP spoofing
It creates a database of whitelist traffic for their IPs, with correspondence to their MAC addresses
It enhances the security of a LAN
All of the above
DHCP snooping can be used to enhance security of a DHCP infrastructure. It can prevent ARP Spoofing, because it refers to the DHCP server, and only allows configured MAC addresses to obtain an IP address.
https://en.wikipedia.org/wiki/DHCP_snooping
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