Networking Concepts.pptx
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The document discusses the OSI model and its layers. It explains that the OSI model divides networking into 7 abstract layers, with each layer having a specific function. It then describes the functions of each layer, including the physical, data link, network, transport, session, presentation, and application layers. The physical layer deals with physical connections. The data link layer ensures error-free transmission. The network layer handles routing and IP addressing. The transport layer provides end-to-end delivery and error checking. The session layer establishes connections and handles security. The presentation layer translates data formats. And the application layer allows access to network services.
Networking Concepts.pptx
- 2. OSI MODEL • The whole networking concept is divided into multiple layers. • Each layer is involved in some particular task and is independent of all other layers. • computer network models - Two different models: – OSI Model – TCP/IP Model
- 3. OSI MODEL • The OSI (Open System Interconnection) provides a standard for different computer systems to be able to communicate with each other. • It’s based on the concept of splitting up a communication system into seven abstract layers. • It is a 7 layer architecture with each layer having specific functionality to perform. • All these 7 layers work collaboratively to transmit the data from one person to another across the globe.
- 4. OSI MODEL
- 5. Functions of the OSI Layers • There are the seven OSI layers. Each layer has different functions. – Physical Layer – Data-Link Layer – Network Layer – Transport Layer – Session Layer – Presentation Layer – Application Layer
- 6. Functions of the OSI Layers 1. Physical Layer (Layer 1) : The lowest layer of the OSI reference model is the physical layer. It is responsible for the actual physical connection between the devices. The physical layer contains information in the form of bits. 2. Data Link Layer (DLL) (Layer 2) : The main function of this layer is to make sure data transfer is error-free from one node to another, over the physical layer. When a packet arrives in a network, it is the responsibility of DLL to transmit it to the Host using its MAC address. 3. Network Layer (Layer 3) : The network layer works for the transmission of data from one host to the other located in different networks. It also takes care of packet routing i.e. selection of the shortest path to transmit the packet, from the number of routes available. The sender & receiver’s IP addresses are placed in the header by the network layer.
- 7. Functions of the OSI Layers 4. Transport Layer (Layer 4) : The transport layer provides services to the application layer and takes services from the network layer. The data in the transport layer is referred to as Segments. It is responsible for the End to End Delivery of the complete message. The transport layer also provides the acknowledgement of the successful data transmission and re-transmits the data if an error is found. 5. Session Layer (Layer 5) : This layer is responsible for the establishment of connection, maintenance of sessions, authentication, and also ensures security. 6. Presentation Layer (Layer 6): The presentation layer is also called the Translation layer. The data from the application layer is extracted here and manipulated as per the required format to transmit over the network. 7. Application Layer (Layer 7) : At the very top of the OSI Reference Model stack of layers. The Application layer which is implemented by the network applications. This layer also serves as a window for the application services to access the network and for displaying the received information to the user. Example: Application – Browsers, Skype Messenger, etc.
- 8. Slide Title • Make Effective Presentations • Using Awesome Backgrounds • Engage your Audience • Capture Audience Attention