An engineer is reviewing another engineer's sample configuration for a GRE tunnel used to pass IPv6 traffiC. The tunnel ha s not yet been configured on the router. Which of the following commands is not required for the configuration to pass IPv6 traffic?（）
- A、tunnel source
- B、tunnel destination
- C、tunnel mode
- D、All these commands are requireD
正确答案:C
答案解析:有
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