Two islands of IPv6 networks that are running ISIS （IPv6 IGP） must be connected using a tunnel over anIPv4 network. Which tunneling method can be used to achieve this goal？（）
- A、GRE tunnels
- B、automatic 6 to 4 tunnels
- C、ISATAP tunnels
- D、manual tunnels （RFC 2893）
正确答案:A
答案解析:有
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