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NEW QUESTION 865
Which IPv6 tunneling mechanism requires a service provider to use one of its own native IPv6 blocks to guarantee that its IPv6 hosts will be reachable?

A.    6rd tunneling
B.    automatic 6to4 tunneling
C.    NAT-PT tunneling
D.    ISATAP tunneling
E.    manual ipv6ip tunneling
F.    automatic 4to6 tunneling