Information Technology: Osi Model Essay

2282 words - 10 pages

To give you a summary of the client and network operating systems pros and cons and what they consist of.
Computers have the ability to act as a server; provide resources to other machines, request resources form other computers and act as a client. These machines have similar levels of capabilities that are considered as peers. The reason for is they share resources with each other (pg. 5). A network operating system (NOS) requires cables that connect the systems through a medium service. These computers are also connected with a NIC card or network adapter (pg.7). This can also be accomplished through a RJ-45 jack, fiber-optic connections or wireless connections today. There are ...view middle of the document...

The client/server pairing is where a Web browser accesses the Web server, which provides access to the Application layer protocol Hypertext Transfer Protocol (HTTP).
Presentation Layer: Known as layer 6; responsible for converting and encrypting the data; defines how data is formatted, presented and converted. This layer is where the protocol conversion, data encryption or decryption, character set issues, and graphics commands are all handled.
Session Layer: Known as layer 5; responsible for establishing, maintaining, and ending communication sessions. This layer permits ongoing communication across the network allowing the applications on both ends of the session to exchange data of the session. This is the session setup, data or message exchange, and teardown that is handled and the session ends. This layer also monitors security services to control access to the session’s information.
Transport Layer: provides flow control and error checking. This layer manages transfer of data from applications to others across the network, breaks segments down to smaller chucks for networking and includes error checks that ensure error-free delivery, reassembles data to the original state for delivery. This layer is also responsible for flow control so the recipient of the data is not overwhelmed with large amounts of data.
Network Layer: is responsible for addressing and routing; ensures information arrives at destination. This is where the addressing happens on the messages for delivery and translating of logical network addresses into their physical counterparts, known as MAC addresses. The layer determines how to route transmissions from the sender to the receiver, based on network conditions, QoS information, alternate routes, and delivery priorities. This is also known as the traffic cop of the network which also handles routing and access control.
Data Link Layer: controls the logical network topologies, is the physical protocol assigned to data and sequencing. This layer handles the delivery of frames of data from the sender and the receiver by way of the Physical layer, then strips the header and trailer information and sends the remaining packet to the Network layer. This layer is responsible for detecting errors in the frame transmission; then it is responsible for discarding frames that have any errors.
Physical Layer: defines physical characteristics of the network.
The standard model for networking protocols and distributed application is the OSI model -7 network layers.
The layers of OSI provides the levels of abstraction.
Each layer performs a different set of functions and the intent was to make each layer as independent as possible from all the others.
Each layer uses the information from the below layer and provides a service to the layer above.
PHYSICAL LAYER
The physical layer, the lowest layer of the OSI model, is concerned with the transmission and reception of the unstructured raw bit stream...

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