OSI 7 Layer understanding and functioning

OSI 7 Layer understanding and functioning - Hallo my friends,, This post is entitled OSI 7 Layer understanding and functioning, All of the content is aim for reader satisfaction. Hopefully all the posts will be easy to understand and likeable.

OSI Camada 7

OSI layer is an abbreviation of the word interconnection open system or ordinary people call OSI layer. Osi layaer itself was created by the International Organization for Standardization. In the old days, before there OSI layer is set, the communication device can not communicate in a different supplier. Examples of such IBM devices unable to communicate with other vendors, so OSI layer default communication in computer networks. Marfrig is itself a structured framework of how the process logic / describe data communication between the interaction networks.

OSI layer 7 consists of layers, namely application, presentation, session, transport, network, data link, and physical. I myself use the acronym to memorize. APS TNDP and OSI are divided into two groups layer (layer) upper and lower.

• Focused on user application top layer and how files are displayed on the computer.
• Focused on lower data communication core layer through a network, and this part is a concern utaman by a network engineer.

From the above image stream layer if we look at the left side (computer A) to the right (Computer B), then flownya is computer A, for example, inquiring request to computer B or could be a computer A ping computer B, then the flow occurring in the sketch is on the computer performs an OSI layer highest to the lowest, from layer to layer 7-1 because the application is still in the layer 7 to layer 1 on computer A

• On the way down to 7.6 layer 5 and still be given, and then down to the layer 4
• In the fourth layer occurs segmentation (data striping) added to the header port number TCP / UDP in this section is additional port sender (Computer A) and the acceptance of port (computer B), the process is called segment
• Layer 3 by an additional header again that an IP address, the IP address of the sender (compuer A) and acceptance IP address (Computer B) this layer is packet call
• Layer 2 by an additional header again that the MAC address, the MAC address of the sender (Computer A) and the MAC address of acceptance (Router 1), surely you will ask "why the acceptance in the router 1 instead of computer B ? " Was concerned at Layer 2 is change the header in each segment are ignored, adds jam a header at layer 2 will be added sisnya trailer called FCS or (Frames Check Sequence) checksum trailer contents tolerated, so to receive this frame form the checksum value and will be checked're still the same or not, if it means valid if the difference means that there is data that is not complete, the process is called Frema.

Layer 2 header will be changed in the Computer A to a router, router to router 1 2 router 2 to Computer B
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OSI 7 Layer understanding and functioning