Checkpoint: The Seven Layers Of The OSI Model

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Checkpoint: OSI Model

Paul Tegner

IT/242

April 22, 2011
Mark Burke

OSI Model

The OSI Model consists of seven layers. These layers are the application layer, presentation layer, session layer, transport layer, network layer, data link layer, and physical layer.
The Application Layer The application layer is responsible for interaction between the operating system and the network services and provides an interface to the system. It provides the user interface to a range of network wide distributed services including file transfer, printer access, and mail (Regan, 2004).

Presentation Layer This layer makes sure that information sent by one application layer protocol from a remote system is readable by another application layer protocol in a
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The transport layer is also responsible for reliable, transparent transfer of data between two end points.
Network Layer The Network Layer concerns itself with the addressing and routing necessary to move data from one network to another.

Data Link Layer The Data Link Layer is responsible for sending data over the channel. It sends frames, defines the station address, and provides link management.

Physical Layer The Physical Layer handles physical signaling, provides access to media, defining voltages and data rates for sending binary data.

A. The layers of the OSI model that WAN protocols operate are the physical layer and the data link layer. B. Some of these protocols are DOCSIS (Data over Cable Service Interface Specification), ISDN (Integrated Services Digital Network), PPP (Point to Point Protocol), PoS (Packet over SONET/SDH), and SDLC (Synchronous Data Link Control). C. The layers of the OSI that switches and routers operate are the physical layer, data link layer, and network

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