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The IPv6 DAD (Duplicate Address Detection) mechanism allows an IPv6 host to verify the uniqueness of the address before using it. It uses NS (Neighbor Solicitation) and NA (Neighbor Advertisement) ICMP packets
IPv6 uses Neighbor Solicitation (NS) and Neighbor Advertisement (NA) packets to perform Duplicate Address Detection (DAD). DAD is used to ensure that no two devices on the same network have the same IPv6 address.
I mean the answer is A, because IPv6 need NS and NA packet to perform duplicate detection.
Reference :
-https://medium.com/networks-security/ipv6-duplicate-address-detection-dad-f83b20cb89aa
-https://blog.apnic.net/2019/10/18/how-to-ipv6-neighbor-discovery/
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