The two bottom layers, called the physical layer protocols, take care of the actual signal transfer over the network cable.

称为 物理层协议的两个底层处理网络电缆上的实际信号传输。

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Architects, however, need to understand the physical layer in order to avoid network bottlenecks and security exposures.

但是，架构师需要了解物理层以避免网络瓶颈和安全暴露。

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But rather than force all of the VM's networking to the physical layer of the platform, local communication could instead be virtualized itself.

但我们不需要把所有VM的联网都强加到这个平台的物理层上，本地通信可自行被虚拟化。

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It features a simple interface and the physical key requirement provides an additional layer of security that avoids using a vendor's redirection service such as those offered by Cloud Engines for PogoPlug or Axentra for Netgear's Stora.

ENGADGET: Switched On: MyDitto NAS has some key issues