【单选题】The network layer provides services to the transport layer.It can be based on either (1).In both cases,its main job is (2) packets from the source to the destination. In network layer,subnets can easi...
【单选题】In the OSI model of network architecture not based on specific model, operating system or company proposed by ISO, layer 2 and layer 4 are respectively ().
【单选题】The network layer provides services to the transport layer.It call be based on either virtual circuits or datagrams.In both cases,its main job is( )packets from the source to the destination.