350-401 · Question #777
Which two statements are true about 6to4 tunneling? (Choose two)
The correct answer is A. It works by appending the public lPv4 address (converted into hexadecimal format) to the D. It embeds the lPv6 packet into the lPv4 payload with the protocol type set to 41.. 6to4 tunneling embeds IPv6 packets into IPv4 packets using protocol type 41 and incorporates the public IPv4 address into the IPv6 address structure.
Question
Options
- AIt works by appending the public lPv4 address (converted into hexadecimal format) to the
- BIt embeds the lPv6 packet into the lPv4 payload with the protocol type set to 51.
- CIt works by appending the private lPv4 address (converted into hexadecimal format) to the
- DIt embeds the lPv6 packet into the lPv4 payload with the protocol type set to 41.
How the community answered
(27 responses)- A89% (24)
- B4% (1)
- C7% (2)
Why each option
6to4 tunneling embeds IPv6 packets into IPv4 packets using protocol type 41 and incorporates the public IPv4 address into the IPv6 address structure.
6to4 tunneling constructs the IPv6 address by taking the standard 2002::/16 prefix and embedding the public IPv4 address of the 6to4 router as the next 32 bits, represented in hexadecimal format.
The IPv4 protocol type for encapsulating IPv6 packets is 41, not 51; protocol type 51 is used for IPsec Authentication Header (AH).
When encapsulating an IPv6 packet within an IPv4 header for 6to4 tunneling, the IPv4 protocol field is set to 41 to indicate that the payload is an IPv6 packet.
Concept tested: 6to4 tunneling characteristics (IPv6 address formation, IPv4 protocol type)
Source: https://datatracker.ietf.org/doc/html/rfc3056
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