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Question: Explain the 7 Layers of OSI.

Answer: Layer 1: Physical layer
It represents all the electrical and physical specifications for devices.

Layer 2: Data link layer
It provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer.

Layer 3: Network layer
The Network layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks.

Layer 4: Transport layer
It provides transparent transfer of data between end users.

Layer 5: Session layer
It controls the sessions between computers. It connects, manages and terminates the connections between the local and remote application.

Layer 6: Presentation layer
It transforms data to provide a standard interface for the Application layer.

Layer 7: Application layer
It provides a means for the user to access information on the network through an application.

Layer 1: Physical layer
It represents all the electrical and physical specifications for devices.

Layer 2: Data link layer
It provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the Physical layer.

Layer 3: Network layer
The Network layer provides the functional and procedural means of transferring variable length data sequences from a source to a destination via one or more networks.

Layer 4: Transport layer
It provides transparent transfer of data between end users.

Layer 5: Session layer
It controls the sessions between computers. It connects, manages and terminates the connections between the local and remote application.

Layer 6: Presentation layer
It transforms data to provide a standard interface for the Application layer.

Layer 7: Application layer
It provides a means for the user to access information on the network through an application. Source: CoolInterview.com

An easy way to Remember:

Please Do Not Throw Sausage Pizza Away(P,D,N,T,S,P,A)
Source: CoolInterview.com

1.physical layer:it is responsible for electrical,mechanical and procedural checks.data will be converted into 0&1's.data will be in the form of electrial pulses
2.datalink layer:it is divided into two parts
MAC LLC
MAC means media acess control
LLC means logic link control
3.network layer:it is responsible for nproviding best path to reach the destination
4.transport layer:providing end to end conectiviy
5.session layer:it is responsible for providing establising,maintainming,termenating section
6.presentation layer:it is used to convert the data into some standard format
7.application layer:responsible for providing networking services to end user Source: CoolInterview.com

Layer Seven of the OSI Model

The Application Layer of the OSI model is responsible for providing end-user services, such as file transfers, electronic messaging, e-mail, virtual terminal access, and network management. This is the layer with which the user interacts.

Layer Six of the OSI Model

The Presentation Layer of the OSI model is responsible for defining the syntax which two network hosts use to communicate. Encryption and compression should be Presentation Layer functions.

Layer Five of the OSI Model

The Session Layer of the OSI model is responsible for establishing process-to-process commnunications between networked hosts.

Layer Four of the OSI Model

The Transport Layer of the OSI model is responsible for delivering messages between networked hosts. The Transport Layer should be responsible for fragmentation and reassembly.

Layer Three of the OSI Model

The Network Layer of the OSI model is responsible for establishing paths for data transfer through the network. Routers operate at the Network Layer.

Layer Two of the OSI Model

The Data Link Layer of the OSI model is responsible for communications between adjacent network nodes. Hubs and switches operate at the Data Link Layer.

Layer One of the OSI Model

The Physical Layer of the OSI model is responsible for bit-level transmission between network nodes. The Physical Layer defines items such as: connector types, cable types, voltages, and pin-outs.

Source: CoolInterview.com

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