Datalink layer essays

Datalink layer essays 2.0 PURPOSE Networking, are becoming essential and common in computer communication in small business, big companies and even home network. Networking is two or more computers linked together using communication medium and run by hardware and software components. The data communication is broken down into several tasks, where one is built over the other. These tasks are handled by entity which interacts with adjacent entity, for example the lower entity support the upper entity. These entities are listed below: 1. Application layer generates data to be transmitted 2. Presentation layer accepts messages generated by the application layer. 3. Session layer to set up dialogue between 1 applications 4. Transport layer ensures all messages are delivered correctly 5. Network layer responsible for collecting and routing the data 6. Data Link layer prepare messages for physical transporting 7. Physical layer transmitting data over the communication medium The seven layer of entity is called open systems interconnection (OSI) model. The OSI model allows communication between different types of computer systems. This assignment focuses on the 2nd layer of the OSI model, how it interacts with adjacent layers, purpose of the layerfunctionality of the layer, protocols and hardware. 2.0 Purpose According Forouzan 2003 data links layer hold a vital role as a second layer in the open standard interconnect (OSI) model. It transmitted information from layer 3 and received data from layer 1.It primary function is to pass a data message to another network or node. Data Link layer work as a filter that check and label wether the data can be send or receive from the next layer. The data link layer also must ensure that the incoming data arrive exactly like it was transmitted by the sender. If the data is corr...