7 layers of Networking

    Interview questions in networks:

7 layers of Networking

Layer 1 PHYSICAL
Layer 2 DATA-LINK
Layer 3 NETWORK
Layer 4 TRANSPORT
Layer 5 SESSION
Layer 6 PRESENTATION
Layer 7 APPLICATION

The function of each layer:

•Physical Layer -The physical layer is concerned with transmitting raw bits over a communication channel though hubs, wires (cat5UTP), modems, network cards… basically anything that is physical to the network.
•THE DATA-LINK LAYER -The data link layer takes raw transmission and transform it into a line that appears free of transmission errors in the network layer
•THE NETWORK LAYER -The network layer is concerned with controlling the operation of the subnet. A ROUTER is used to determining how packets are routed from source to destination
•THE TRANSPORT LAYER -The transport layer “DIRECTS PACKETS”, splits it up into smaller units if need be, pass these to the network and ensure that the pieces are travelling in an orderly fashion.
•THE SESSION LAYER -The session layer allows different machines to establish sessions between themselves
•THE PRESENTATION LAYER -The Presentation Layer’s job is managing data restructures and converting from the representation used inside the computer to the network standard representation an visa versa
•THE APPLICATION LAYER -The Application layer contains a variety of protocols that are commonly required. Another Application layer function is file transfer. Different file systems have different file naming conventions, different ways of representing text lines, and so on