Discussion
Dual-stack approach refers to
Answer: C
Dual stack means the node has both IPv4 and IPv6 support.
Dual stack is one of the strategies for the move from IPv4 to IPv6: a host or router runs both protocol stacks side by side, so it can talk IPv4 to IPv4 systems and IPv6 to IPv6 systems, choosing by the destination address.
It does not mean two copies of the same protocol, so 'IPv4 with 2 stacks' and 'IPv6 with 2 stacks' are wrong. Tunnelling and header translation are the other transition strategies.
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