You work as a network engineer， do you know an IPsec tunnel is negotiated within the protection of whichtype of tunnel？（）
- A、L2F tunnel
- B、L2TP tunnel
- C、GRE tunnel
- D、ISAKMP tunnel
正确答案:D
答案解析:有
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You work as a network engineer， do you know an IPsec tunnel is negotiated within the protection of whichtype of tunnel？（）
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