A network administrator is implementing Dynamic ARP Inspection (DAI) on a switch to mitigate ARP spoofing attacks. For DAI to function correctly in a dynamic environment, which source of information does it primarily rely on to validate the bindings between IP and MAC addresses?
Dynamic ARP Inspection (DAI) primarily uses the DHCP snooping binding database to validate ARP packets. This database is built by the DHCP snooping feature, which listens to DHCP transactions and records the legitimate IP address-to-MAC address bindings assigned by the DHCP server. When an ARP packet arrives on an untrusted port, DAI intercepts it and compares the sender's IP and MAC addresses against the entries in this database. If a match is found, the packet is forwarded; otherwise, it is dropped. While static ARP ACLs can be used, the DHCP snooping database is the primary source in dynamic environments. The switch's MAC address table maps MACs to ports, and the local ARP cache is what DAI protects from being poisoned.
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Cisco CCNA 200-301
Security Fundamentals
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