在主机内部直接与CPU交换信息的存储器成为内存或主存。

In the mainframe, memory that directly transit information with CPU is referred to as internal memory or primary storage.

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再上一层称为传输层，负责端到端的通信（例如，在一台主机内部）。

The next layer, called the transport layer, is responsible for peer-to-peer communication (for example, within a host).

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尽管网络层负责管理主机之间的通信，但是传输层需要负责管理主机内部各端之间的通信。

While the network layer manages communication between hosts, the transport layer manages communication between endpoints within those hosts.

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