What will occur when an IPv6 enabled router running 6to4 must transmit a packet to a remote destination and the next hop is the address of 2002::/16 ?
A.
The IPv6 packet has its header removed and replaced with an IPv4 header
B.
The IPv6 packet is encapsulated in an IPv4 packet using an IPv4 protocol type of 41
C.
The IPv6 packet is dropped because that destination is unable to route IPv6 packets
D.
The packet is tagged with an IPv6 header and the IPv6 prefix is included
Answer is B
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6to4 embeds an IPv6 packet in the payload portion of an IPv4 packet with protocol type 41. To send an IPv6 packet over an IPv4 network to a 6to4 destination address, an IPv4 header with protocol type 41 is prepended to the IPv6 packet. The IPv4 destination address for the prepended packet header is derived from the IPv6 destination address of the inner packet (which is in the format of a 6to4 address), by extracting the 32 bits immediately following the IPv6 destination address’s 2002::/16 prefix. The IPv4 source address in the prepended packet header is the IPv4 address of the host or router which is sending the packet over IPv4. The resulting IPv4 packet is then routed to its IPv4 destination address just like any other IPv4 packet.
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