单项选择题

Whichofthesestatementsbestdescribesthemajordifferencebe……

Which of these statements best describes the major difference between an IPv4-compatible tunnel and a 6to4 tunnel？（）

A. An IPv4-compatible tunnel is a static tunnel， but an 6to4 tunnel is a semiautomatic tunnel.
B. The deployment of a IPv4-compatible tunnel requires a special code on the edge routers， but a 6to4 tunnel does not require any special code.
C. An IPv4-compatible tunnel is typically used only between two IPv6 domains， but a 6to4 tunnel is used to connect to connect two or more IPv6 domains.
D. For an IPv4-compatible tunnel， the ISP assigns only IPv4 addresses for each domain， but for a 6to4 tunnel， the ISP assigns only IPv6 addresses for each domain.

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A. prefixes received from any other BGP peer and prefixes locally originated via networkstatements or redistributed to BGP
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A.interface gig3/1 spanning-tree guard root
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A. prefixes received from any other BGP peer and prefixes locally originated via network statements or redistributed
B. all prefixes in its routing table
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