1. 20031964[Minsu Kim] bluewins84@naver.com
Network OSI 7 Layer
[Minsu Kim]

2. Summary OSI Model Application Layer Presentation Layer Session Layer
Transport Layer
Network Layer
Data Link Layer
Physical Layer

3. 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

4. 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

5. The OSI Model Application Presentation Session Transport Network
Data Link
Physical

6. 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

7. 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

8. The Session Layer
As its name implies, the session layer establishes, manages, and terminates session between tow communicating host

9. 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

10. 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

11. The Data Link Layer
The data link layer provides reliable transit of data across a physical link

12. 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

13. Q&A