A dual stack network involves nodes that are capable of processing IPv4 and IPv6 traffic simultaneously. When a node within a dual stack network receives traffic, it is programmed to prefer IPv6 over IPv4 traffic. In the event that the traffic it receives is solely IPv4, then the dual stack node is capable of processing it as well.
Dual stack networking is one of several solutions for migrating from IPv4 to IPv6, but it is also one of the most expensive.
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