思科安全虚拟专有网络 Cisco Secure Virtual Private Networks

安全虚拟网络 Quantum/Melange Networks ; Secure Virtual Network ; SVN

安全虚拟私用网络 security virtual private network

的安全虚拟网络 Secure Virtual Network ; SVN

层安全虚拟专用网络 IPSEC VPN ; IP Security virtual private network

虚拟网络安全 Virtual Network Security