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【单选题】
服务与协议是完全不同的两个概念,下列关于它们的说法错误的是( )A.
在协议的控制下,两个对等实体间的通信使得本层能够一层提供服务。要实现本层协议,还需要使用下面一层所提供的服务
B.
协议是水平的,即协议是控制对等实体间通信的规则。服务是垂直的,即服务是下层向上层通过层间接口提供的
C.
OSI将层与层之间交换的数据单位称为协议数据单元PDU
D.
协议的实现保证了能够一层提供服务
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A.
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