One is t he MAC(media access control) add ress, second is the IP. Dynamic ARP protection is implemented in the following ways on a switch. When dynamic ARP protection is enabled, only ARP request and reply packets with valid IP-to-MAC address bindings in their packet header are relayed and used to update the ARP cache. ARP packets that contain invalid IP addresses or MAC addresses in their body that do not match the addresses in the Ethernet header are dropped.
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