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The OSI Model

Networking - The OSI Model

FunctionOSI Layer
Which layer provides a set of interfaces for applications to obtain access to network services? Application
This layer handles general network access, movement of data and error recovery for applications. Application
An example of software that resides at this layer include FTP, HTTP as well as client software such as Novell's client. Application
This layer handles data format information for network communications. Presentation
This layer converts data into a generic format that can survive the rigors of transmission. Presentation
This layer can handle protocol conversion, data encryption or decryption, character set issues and graphics commands. Presentation
A redirector that intercepts requests for service from the computer and sends them to the network for servicing operates at this layer Presentation
An example of functionality at this layer would be a Web browser displaying graphic files embedded in a Web page. Presentation
This layer can handle character conversion such as a carriage return in different systems such as PC, Linux and Unix. Presentation
This layer is what permits two parties to hold ongoing communications. Session
This layer handles session setup, data or message exchanges and teardown when the session ends. Session
Some of the network functions handled by this layer include name lookup and user login and logout. Session
Domain Name System resolution and NetBIOS name resolution operate at this layer. Session
This layer manages the mechanics of an ongoing communication including identifying which side may transmit data when and for how long. Session
This layer provides synchronization services between tasks on both ends of a connection. Session
This layer manages the conveyance of data and flow control. Transport
This layer segments long data payloads into chunks that match the maximum packet size for the network medium. Transport
This layer makes sure that the recipient of transmitted data is not overwhelmed with more data than it can handle. Transport
The components that work at this layer include the TCP portion of TCP/IP and the SPX portion of IPX/SPX. Transport
This layer handles addressing messages for delivery. Network
This layer translates logical network addresses into their physical counterparts. Network
This layer decides how to route transmissions from sender to receiver. Network
This layer is considered the traffic cop for network activity because it handles packet switching, data routing, and congestion control. Network
Routers operate at this layer. Network
This layer handles delivery of frames from sender to receiver through the Physical layer. Data Link
The NIC driver operates at this layer. Data Link
This layer is responsible for detecting errors in the transmission of frames. Data Link
The hardware that operate at this layer are NIC cards and switches. Data Link
This layer is responsible for converting bits into signals for outgoing messages. Physical
This layer manages the computer's interface to the network medium. Physical
This layer is where specification of all details for creating a network connection occur. Physical
The components working at this layer include all of the cables and connectors used on the medium, plus repeaters and hubs. Physical
This layer encodes ones and zeros, the timing and interpretation of signals sent across the medium. Physical
Created by: LauraKathryn