Click the Exhibit button. 
[A] establishes an IPsec tunnel with [B]. The NAT device translates the IP address 1.1.1.1 to 2.1.1.1.On which port is the IKE SA established?（）
- A、TCP 500
- B、UDP 500
- C、TCP 4500
- D、UDP 4500
正确答案:D
答案解析:有
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