Answer to Question #338120 in Computer Networks for lawrence

Question

the functions of each layer of the osi model and protocols used

Answer 1

1. Physical Layer

It is the last layer of the model responsible for preparing physical devices in the network for data acceptance. It can also terminate the connection between two nodes of a network.

2. Data Link Layer

This layer allows access to get the data by breaking it into frames for easier analysis. This ensures that data is error-free and reaches the next layer in time. It sends data in the form of packets. 

3. Network Layer

It is the network controller layer responsible for transferring data from one node to another in a network. Every node has a unique address and this layer reads them to send data to the correct destination. It sends data in packet form while later connects after processing.  

4. Transport Layer

The transport layer manages the delivery of packets and is the heart of the OSI model. It monitors the data, segmentation/desegmentation, and controls error. This layer starts from TP0 and continues till TP4 for fragmentation or reassembling data.

5. Session Layer

The number of computers in the network establishes a connection in this layer. It also takes care of establishing, managing, and terminating remote and local applications. They can also choose to terminate a complete session/transmission.

6. Presentation Layer

This layer is responsible for converting data into semantics understood by an application. It formats the data by compression, encryption, etc., and then sends it further to other layers. It is the translator of the networking model. 

7. Application Layer

This is the layer where users interact with the data. The layer identifies communication partners that will allow data transmission for an application. Some of the applications are – Browsers, Messengers, etc. Desktop Layer is another word for this layer.