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����������� OSI Model
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Their are seven layers to the OSI model in computing.� The OSI model or Open Systems Interconnection is the basis for open system protocols and describes network architecture composed of layers. �
Physical Layer- This is the layer where the signals are sent and received as bits of data.� On this layer the hardware specifications are decided for the cables, NIC cards, and connectors. Data Link Layer- This layer ensures error free delivery of information from the sender to the receiver by proving cyclical redundancy checks (CRC).� This ensures that information is received in its entirety and that all the packets were received. Network Layer- This layer handles the addressing of the packets from sender to receiver. When sending a packet these items are considered; network conditions, quality of service information, cost of alternative routes, and delivery priorities. Transport Layer-� If a packet is to large, this layer will break it into smaller manageable chunks as dictated by the protocol.� This layer also handles flow control of information and error handling. Session layer- This layer sets up communication with another computer on a network.� It maintains and eventually terminates this communication.� Throughout communication it maintains that only the designated computers participate in communication. Presentation Layer- This layer handles protocol conversion, data encryption, decryption, character set and graphics commands.� The presentation layer handles the data format for network communication. It converts data from it's generic format to that of the receiving computer. Application Layer- It provides the interface to allow program applications to receive network application, messages, file transfer and general network access. � Easy phrase to remember Layers:�� Please Do Not Throw Sausage Pizza Away.
���������� This page was last updated on March 5, 1999.� |
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