Which tunneling mechanism embeds an IPv4 address within an IPv6 address?
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A. B. C. D. E.B
The correct answer is B. 6to4.
6to4 is a tunneling mechanism that allows IPv6 packets to be transmitted over an IPv4 network. It embeds an IPv4 address within an IPv6 address, using a 16-bit identifier known as the IPv6 prefix. The prefix is derived from the IPv4 address and a well-known 6to4 prefix (2002::/16).
When a 6to4 router receives an IPv6 packet, it encapsulates the packet in an IPv4 packet and sends it across the IPv4 network. When the packet reaches the destination 6to4 router, it is decapsulated and the original IPv6 packet is forwarded to its destination.
Teredo is another tunneling mechanism that allows IPv6 packets to be transmitted over an IPv4 network, but it uses UDP encapsulation and does not embed an IPv4 address within an IPv6 address.
GRE (Generic Routing Encapsulation) is a tunneling protocol that can be used to encapsulate any protocol over any network layer protocol. It does not embed an IPv4 address within an IPv6 address.
ISATAP (Intra-Site Automatic Tunnel Addressing Protocol) is a tunneling mechanism that allows IPv6 packets to be transmitted over an IPv4 network without the need for explicit tunnel configuration. It uses an IPv4 address to create an IPv6 address and does not embed an IPv4 address within an IPv6 address.
Therefore, the correct answer to the question is B. 6to4.