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The Open Systems Interconnection (OSI) model consists of seven layers of network functionality, with the application layer being the highest. It manages communication programs like FTP, HTTP, and email. The OSI model is designed hierarchically, with each layer having specific responsibilities for sending messages across the network. Instant Messaging and email applications use the application layer protocol.
A computer network is usually designed based on a network diagram. This topology is defined according to the Open Systems Interconnection (OSI) model and consists of seven layers of network functionality. The application layer is the highest layer within OSI, known as layer seven. It is the network layer that manages communication programs on the network, including file transfer protocol (FTP), hypertext transfer protocol (HTTP), and e-mail. These programs allow Internet browsers and email applications to share data over a network.
A network starts with a physical cable and ends with a computer application. Data is forced through several layers of transformation during a typical communication transfer. This is a necessary process to ensure compliance with the correct data security and quality rules. The OSI model was created to allow for flexibility in software protocols.
The OSI model consists of seven layers. These are the physical, datalink, network, transport, session, presentation and application layers. Layers work within a hierarchical structure to send messages across a network.
Most computer networks today use standard Transmission Control Protocol (TCP/IP) as the communication language for the Internet. This network protocol uses the OSI model as a model for how network devices and software should interact. Each layer in the model has a specific responsibility within the network topology.
The OSI model is designed on the basis of a hierarchical chain of responsibilities. These rules force each layer to follow specific transfer processes when sending a message across the topology. The application layer must follow the transfer rules of the presentation layer, which is the next layer in the hierarchy chain. These rules typically include specific format, encryption, and size requirements before the message can be accepted by the next level in the chain.
Instant Messaging (IM) is a communication protocol used on cell phones and computer systems. IM is an example of software that uses the application layer protocol. The standard IM protocol allows companies to build instant messaging software. Some examples of these products include AOL® Instant Messenger, Yahoo® mail and MSN® messenger. Each program uses OSI standards to send and receive messages across the network at this level.
Microsoft Outlook® is an example of an email application that uses the application layer. This is the lowest level of the OSI model, which is responsible for packaging messages from a software program into a computer understandable message. The application layer sends a message to the presentation layer, which is responsible for encrypting and formatting the message.
