What does the OSI model represent?

Answer 1

The OSI Model is involved in networking, and consists of 8 layers. Without going into much detail, the layers from top to bottom are...

Application

Presentation

Session

Transport

Network

Data Link (Upper sub layer Logical Link Control, lower Media Access Control)

Physical

If you need to know more, the course CCNA 1 in Cisco networking is based on this model amongst other things, as well as the TCP/IP model, which is a simpler version of OSI.

Answer 2

OSI Network ModelThe Open Systems Interconnection model (OSI model) is a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a way of sub-dividing a communications system into smaller parts called layers. A layer is a collection of similar functions that provide services to the layer above it and receives services from the layer below it. On each layer, an instance provides services to the instances at the layer above and requests service from the layer below.Physical Layer

The Physical Layer defines the electrical and physical specifications for devices. In particular, it defines the relationship between a device and a transmission medium, such as a copper or optical cable.. Its main task is the transmission of a stream of bits over a communication channel.

Data Linking Layer

The Data Link Layer 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. Originally, this layer was intended for point-to-point and point-to-multipoint media, characteristic of wide area media in the telephone system

Network Layer

The Network Layer provides the functional and procedural means of transferring variable length data sequences from a source host on one network to a destination host on a different network, while maintaining the quality of service requested by the Transport Layer (in contrast to the data link layer which connects hosts within the same network

Transport Layer

The Transport Layer provides transparent transfer of data between end users, providing reliable data transfer services to the upper layers. The Transport Layer controls the reliability of a given link through flow control, segmentation/desegmentation, and error control.

The Session Layer

This Layer provides a user interface to the network where the user negotiates to establish a connection. The user must provide the remote address to be contacted.. In some protocols it is merged with the transport layer. Its main work is to transfer data from the other application to this application so this application is mainly used for transferred layer.

Presentation Layer

The Presentation Layer establishes context between Application Layer entities, in which the higher-layer entities may use different syntax and semantics if the presentation service provides a mapping between them.

Application Layer

The Application Layer is the OSI layer closest to the end user, which means that both the OSI application layer and the user interact directly with the software application. This layer interacts with software applications that implement a communicating component. partners, the application layer determines the identity and availability of communication partners for an application with data to transmit

Answer 3

OSI model is a standard for network design..

Answer 4

P- physical

D- data link

N- network

T- transport

S- session

P- protocol

A- aplication