Which of the following mechanisms is used to enable IPv6 hosts to communicate over an IPv4 network?
Tunneling
VLAN
Level 3 Switching
Dual stack
Tunneling is a method used to encapsulate IPv6 packets within IPv4 packets, allowing them to be sent over IPv4-only network segments. This mechanism is essential for the coexistence of new and existing network infrastructures during the transition period from IPv4 to IPv6. Dual stack involves running both IPv4 and IPv6 protocol stacks in parallel on a device, allowing it to communicate on either type of network, but this does not by itself enable communication across an IPv4-only network. Level 3 Switching, another term for routing, is the general function of forwarding packets between different networks based on Layer 3 addresses; it is not a specific IPv6 transition mechanism. VLANs are used to segment networks at Layer 2 and are unrelated to IPv6-to-IPv4 communication.
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