ISO/IEC 8348:2002根据抽象服务定义定义了由网络层提供给传输层的一组能力。对于传输层协议的设计者来说，它提供了网络服务的定义，以允许独立于网络层协议细节的设计和实现。对于网络层协议的设计者来说，它定义了通过协议的操作而可用的一组功能。

ISO/IEC 8348:2002 defines the set of capabilities, in terms of abstract service definition, provided by the Network Layer to the Transport Layer. For designers of Transport Layer protocols, it provides a definition of the Network service to allow design and implementation independent of details of the Network Layer protocol. For designers of Network Layer protocols, it defines the set of capabilities to be made available through the action of the protocol.