You can also link layers to certain kinds of artifacts that do not support layer validation.

您也可以将图层连结到特定种类的成品，这种成品不支援图层验证。

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Layers 1 and 2 are the physical and data link layers, respectively, fulfilled by the Ethernet network.

层1和层2分别是物理层和数据链接层，通过以太网实现。

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Each layer USES the layers beneath it, so the network layer does not need to worry about how each hop on the network USES the physical and data link layers and so forth.

每一层都使用它下面的层，因此网络层不必担心网络上的每次跳转如何使用物理和数据链接等问题。

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In one notable case, when the industry agreed on a standard some years ago for the interoperation of digital consumer devices (the Digital Living Network Alliance or DLNA), the standards body, which included every company but Apple, agreed on specifications for six layers: connectivity, IP networking, discovery and control, media transport, media formats, and link protection.

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