The dual-layer-IP allows ipv4 and ipv6 at the network layer to access a single tcp/udp stack.
The word dual-stack is a word that connote a full or total duplication of all stages in the protocol stack ranging from its applications to the network layer.
Note that the dual-layer-IP method often gives room for a computer to run IPv4 and IPv6 simultaneously at the network layer, and all of the IP stack can access a different TCP/UDP stack.
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