Which statement is true regarding IPsec VPNs?（）
- A、There are five phases of IKE negotiation.
- B、There are two phases of IKE negotiation.
- C、IPsec VPN tunnels are not supported on SRX Series devices.
- D、IPsec VPNs require a tunnel PIC in SRX Series devices.
正确答案:D
答案解析:有
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