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Which IPv6 tunneling type establishes a permanent link between IPv6 domains over IPv4?
Correct Answer: D
Explanation/Reference: Explanation: A manually configured tunnel is equivalent to a permanent link between two IPv6 domains over an IPv4 backbone. The primary use is for stable connections that require regular secure communication between two edge routers or between an end system and an edge router, or for connection to remote IPv6 networks. Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/ip6- tunnel.html