Dual-stack implementations are implementations where internetwork devices and hosts used both protocol stacks, i.e. IPv4 and IPv6, at the same time. Dual-stack implementation allows the hosts to use either IPv4 or IPv6 to establish end-to-end IP sessions with other hosts.
Dual-stack implementation does not automatically mean that the IPv4-only and IPv6-only hosts have the ability to communicate with each other. To do so, additional protocols and mechanisms are needed. Dual-stack simply means that the hosts (and infrastructure) are able to support both the IPv4 protocol stack and the IPv6 protocol stack . . .
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