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What exactly does "dual stack" mean?

Dual-stack is an interface that supports IPv4 as well as IPv6 protocols. As all of the nodes in a dual-stack network are able to process IPv4 and IPv6 traffic concurrently, security becomes vulnerable in the model. Network engineers need to just double their effort in order to ensure the security. They need to monitor and filter applications on both IPv4 and IPv6. However, with good IP sub-netting scheme and no NAT with IPv6, ACLs can be made simple within the organization. Therefore it has the potential to become more secure.
  
Dual-stack network is programmed in such a way that if a node receives traffic, automatically it prefer IPv6 over IPv4. This network is the most expensive, and considered as one of the solutions for migration from IPv4 to IPv6

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