The purpose of this layer is to define the application layer protocol for the exchange of cellular subscriber information between networks. 這一層的主要用途是為了定義在網(wǎng)絡(luò )間交換蜂窩網(wǎng)絡(luò )用戶(hù)信息的應用層協(xié)議。
Unlike RIP OSPF uses IP directly, OSPF packets being identified by a special value in the IP datagram protocol field. 傳輸層協(xié)議提供計算機之間的通信會(huì )話(huà)，并確保數據在計算機之間可靠地傳輸。
