20031964[Minsu Kim] bluewins84@naver.com Network OSI 7 Layer 20031964[Minsu Kim] bluewins84@naver.com
Summary OSI Model Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer
The OSI Model The Open System Interconnection Model The early development of LANs, MANs was chaotic in many ways By the mid-1980s, these companies began to experience difficulties from all the expansions they had made
The OSI Model The IOS created a network model that would help vendors create networks that would be compatible with and operate with other networks The OSI reference model is the primary model used as a guideline for network communications
The OSI Model Application Presentation Session Transport Network Data Link Physical
The Application Layer The application Layer is the OSI layer that is closet to the user. It provides network services to the user’s applications
The Presentation Layer The presentation layer ensures the information that the application layer of one system send out is readable by the application layer of another system
The Session Layer As its name implies, the session layer establishes, manages, and terminates session between tow communicating host
The Transport Layer The transport layer segments data from the sending host’s system and reassembles the data into a data stream on the receiving host’s system
The Network Layer The network layer is a complex layer that provides connectivity and path selection between two host system that might be located on geographically separated networks
The Data Link Layer The data link layer provides reliable transit of data across a physical link
The Physical Layer The physical layer defines the electrical, mechanical, procedural, and functional specifications for activating, maintaining, and deactivating the physical link between end system
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