In short, this driver provides user-space access to the Ethernet device so that packets can be transmitted and received.
简单地说，这个驱动程序提供对以太网设备的用户空间访问，这样就可以发送和接收数据包。
Examples of devices at this layer include the SLIP driver over a serial interface or an Ethernet driver over an Ethernet device.
例如，包串口使用的SLIP驱动程序以及以太网设备使用的以太网驱动程序都是这一层的设备。
The TAP driver allows the guest operating system to read or write raw Ethernet frames to a virtual Ethernet device (extended to user space).
TAP驱动程序使访客操作系统能够将原始以太网帧写到一个虚拟以太网设备(用户空间的扩展)。
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