The first to third layers of the OSI reference model are called the bottom layer, also known as the medium layer. The bottom layer is responsible for data transmission in the network. The fifth to…

The first to third layers of the OSI reference model are called the bottom layer, also known as the medium layer. The bottom layer is responsible for data transmission in the network. The fifth to seventh layers are called the high layer, also known as the host layer. Network interconnection devices are often located in the upper three layers and are implemented by a combination of hardware and software.