UNDERSTANDING OSI LAYER ASSALAMUALLAIKUM WR WB.
My friends, Welcome to my blog this time I will provide material about the OSI Layer, as we know that OSI Layer has 7 Layer levels, I will explain here in as much detail as possible about the OSI Layer so you know what OSI is Layer, Various OSI Layers, Strengths and Weaknesses, Let me quickly see the material below and understand it correctly.
UNDERSTANDING OSI LAYER (OSI MODEL) Open System Interconnection or commonly abbreviated as OSI is a reference model in the form of a conceptual framework that defines the connection standard for a computer. The purpose of making this OSI reference model is to become a reference for vendors and developers so that the products or software they create can be corporate, which means they can work with other systems or products without having to make special efforts from the user.
KINDS OF OSI LAYER LAYERS WITH ITS FUNCTION 1. Physical Layer Physical layer is the lowest layer in the OSI Layer, this layer serves to define network transmission media, network design, network topology and cabling. This layer is known as the layer that controls wiring.
2. Data Link Layer (Data Link Layer) The Data Link layer serves to determine how data bits are grouped into a format often called Frame. On the second layer in the OSI there is error correction, flow control, hardware addressing or what is called MAC Address and determine how network devices (network hardware) such as Hub, Bridge and Repeaters. This layer is shared by IEEE 802 into two child levels, namely: LLC (Logical Link Control) and MAC (Media Access Control).
3. Network Layer Network Layer Functioning to define IP addresses, create headers for packets and then routing through the internet working by using routers and layer switches 3. This layer must be responsible for determining the address of a network, determining the network route to be taken, keeping the queue traffic on the network.
4. Transport Layer (Transport Layer) The Transport layer serves to break data into data packages and provide sequence numbers to those packages so that they can be rearranged on the destination side after they are received. This layer is responsible for dividing data into segments and providing error handling.
5. Session Layer The Session layer functions to define how connections can be made, maintained or destroyed, name resolution is also done at this layer. This layer is responsible for determining how the two terminals maintain, maintain and manage connections.
6. Presentation Layer The Presentation layer serves to translate the data that the application wants to transmit into a format that can be transmitted over the network. Protocol that is in this level is software director (Redictor Software). Such as worksatation services (in Windows NT) as well as Network Shell (such as Virtual Network Computing) (VNC) or Remote Desktop Protocol (RDP). This layer works how data is converted and formatted for data transfer.
7. Application Layer It functions as an interface with applications with network functionality, manages how applications can access the network, and then makes error messages. The protocols in this layer are HTTP, FTP, SMTP, and NFS. This layer works to provide services for user applications, this layer is responsible for the exchange of information between computer programs, such as e-mail programs and other services running on the network such as a printer server or computer application.
Advantages and disadvantages of OSI
The advantages of the OSI Model in network discussion - Providing the same language and reference among fellow network professionals
- Divide network tasks into logical layers for convenience
- in understanding
- Provide flexibility for special features at different levels
- Facilitate troubleshooting
- Encourage standard interoperability between networks and devices
- Provide modularity in network features
Weakness of the OSI Model in network discussion - OSI Layer-2 is theoretical and does not perform actual functions
- In industrial implementation it is rare to have a layer to layer relationship
- Different protocols in the stack perform different functions that help receive and send message data as a whole
- Implementation of a particular protocol may not represent every OSI layer (or can be spread over several layers)
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WASSALAMUALLAIKUM WARAHMATULLAHI WABARAKATHU
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