IANA在可聚合全球单播地址范围内指定了一个格式前缀来表示IPv6的6to4地址，该前缀为（ ）。
- A.0x1001
- B.0x1002
- C.0x2002
- D.0x2001
正确答案及解析
正确答案
解析
本题考查可聚合全球单播地址的知识。 6to4 隧道采用特殊的 IPv6 地址。 IANA（因特网编号分配委员会）为 6to4 隧道方式地分配了一个永久性的IPv6 格式前缀 0x2002 ，表示成IPv6 地址前缀格式为 2002::/16 。如果一个用户站点拥有至少一个有效的全球唯一的 32 位IPv4 地址（v4ADDR），那么该用户站点将不需要任何分配申请即可拥有如下的 IPv6 地址前缀 2002v4ADDR::/48 。
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