osi layers

 OSI layers

Application layer-it identify user application such as sharing of data,remote connection,internet access etc.

presentation layer-it maintains format of data such as compression,encryption,docx,pptx etc.

session layer-responsible to esablish,maintain and terminate connection between two devices.

transport layer-responsible to transfer data.Functions are flow control,segmentation etc.

segmentation-dividing large size of data into small packets.

source and destination ports are added in this layer

Network layer-responsible to check network connectivity.Also add sr and dest ip addresses to data.

Data link layer-it has two sub layers

1.LLC-logical link control-used to check errors in data

2.MAC-used to add sr and dest mac addresses to data

Physical layer-responsible to check physical connections of devices in network`.