The three layers described above provide an integrated and standardized network platform to allow service providers to offer a variety of multimedia services in the service layer.
上面描述的三个层提供了一个集成的标准网络平台，以允许服务提供商在服务层中提供各种多媒体服务。
2
NetBIOS provides a name serviceslayer responsible for network browsing and name lookups.
NetBIOS提供一个名称服务层，负责网络浏览和名称查找。
3
Each layer employs the services of the layer underneath, which enables a top layer protocol to transmit messages over the physical network.