The application servers in n-tier architecture host remotely accessible business components. These are accessed by the presentation layer web server over the network using native protocols.
N级结构中的应用服务器负责提供可远程访问的业务逻辑组件，而表现层网页服务器则使用本网协议通过网络访问这些组件。
The Link Layer is the networking scope of the local network connection to which a host is attached.
链路层是指本地网络到每一台被连接主机的网络范围。
When error correction is not required, UDP provides unreliable datagram service that enhances network throughout at the host-to-host transport layer.
如果没有要求更改错误，则UDP提供不可靠的数据服务，从而增加网络在传输层的吞吐量。
When error correction is not required, UDP provides unreliable datagram service that enhances network throughout at the host-to-host transport layer.
如果没有要求更改错误，则UDP提供不可靠的数据服务，从而增加网络在传输层的吞吐量。
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