VPN涉及的关键安全技术中不包括（）。A、隧道技术B、加密技术C、入侵检测技术D、身份认证技术
VPN涉及的关键安全技术中不包括（）。
- A、隧道技术
- B、加密技术
- C、入侵检测技术
- D、身份认证技术
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