When devices are emulated, such as virtual network adapters, the emulation provides a layer to abstract away the physical hardware.
当设备被模拟(比如虚拟网络适配器)时，模拟提供一个抽象层以抽象物理硬件。
Likewise, if all communication at the physical layer was lost, HA would continue to think the network was OK, as it is still able to route traffic across the virtual LAN on the Hypervisor.
同样，如果物理层的所有通信中断了，HA仍然会认为网络是正常的，因为它仍然能够通过Hypervisor上的虚拟lan路由通信流。
The StrongPoint security appliance creates a secure virtual-network layer connection between the traffic management system and the communications network endpoints.
StrongPoint网络安全装置在交通管理系统和通信网络终端之间创造了一个安全的虚拟网络连接层。
The StrongPoint security appliance creates a secure, virtual-network layer connection between the traffic management system and the communications network endpoints.
StrongPoint网络安全装置在交通管理系统和通信网络终端之间创造了一个安全的虚拟网络连接层。
This paper presented the virtual telephony network, P_VPN. The architecture of P_VPN includes management layer, transmission layer and control plane.
文章提出了电话虚拟专网P_ VPN安全模型，其体系包括管理层、传输层和控制面。
This paper presented the virtual telephony network, P_VPN. The architecture of P_VPN includes management layer, transmission layer and control plane.
文章提出了电话虚拟专网P_ VPN安全模型，其体系包括管理层、传输层和控制面。
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