Each layer employs the services of the layer underneath, which enables a top layer protocol to transmit messages over the physical network.

每个层都使用下面一层的服务，这使得顶层协议能够在物理网络上传输消息。

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For reliable network services, many administrators prefer deployment of the TCP-IP protocol in their infrastructure.

对于可靠的网络服务，许多管理员喜欢在基础结构中部署TCP - IP协议。

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Protocol independence: Protocol independence refers to the idea that clients can access services without regard to the communication/network protocol.

协议独立性：协议独立性指客户机在不考虑通信／网络协议的情况下访问服务。

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That set the stage for Cisco to sell the department on improving that network with services such as video conferencing and voice-over-Internet Protocol.

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