In networking ,the most commonly used model is 5-layer model besides OSI model and 4 -layer model with some changes made to 5-layer model 5-Layers: Physical Layer Data-Link Layer Network Layer Transport Layer Application Layer Physical Layer Represents the physical devices that interconnect computers Data Link Layer / Network Access Layer Responsible for defining a common way of interpreting the signals produced by the physical layer so that network devices can communicate. It uses Ethernet Protocol to efficiently send data packets i.e Ethernet frames in this layer).Ethernet protocol makes sure the node’s identity (i.e MAC address-Hardware address)to send the data packets Network Layer Allows different networks to communicate with each other through devices known as routers. Network layer deliver data across a collection of networks. This layer uses IP(Internet Protocol) predominantly to find the correct network where the destination node is present through...