Network topology

[sukishan]

The network topology defines the way in which computers, printers, and other devices are connected, physically and logically. A network topology describes the layout of the wire and devices as well as the paths used by data transmissions.

Network topology has two types:

* Physical
* logical
Commonly used topologies include:
Bus
Star
Tree (hierarchical)
Linear
Ring
Mesh
partially connected
   - fully connected (sometimes known as fully redundant)
   - The network topologies mentioned above are only a general representation of the kinds of topologies used in computer network and are considered basic topologies.

OSI Model
Main article: OSI model

Behind the scene networking is defined by the standard of Open Systems Interconnection (Open Systems Interconnection) reference for communications. The OSI model consists of seven layers. Each layer has its own function. The OSI model layers are Application, Presentation, Session, Transport, Network, Data Link, and Physical. The upper layers (Application, Presentation, Session) of the OSI model concentrate on the application while the lower layers (transport, network, data link, and physical) focus on signal flow of data from origin to destination.

The Application layer defines the medium that communications software and any applications need to communicate to other computers. Layer 6 which is the presentation layer focuses on defining data formats such as text, jpeg, gif, and binary. An example of this layer would be displaying a picture that was received in an e-mail.

The 5th Layer is the session layer which establishes how to start, control, and end links or conversations. The transport layer includes protocols that allow it to provide functions in many different areas such as: error recovery, segmentation, and reassembly.

The network layers primary job is the end to end delivery of data packets. To do this, the network layer relies on logical addressing so that the origin an destination point can both be recognized. An example of this would be, ip running in a router's job is to examine the destination address, compare the address to the ip routing table, separate the packet into smaller chunks for transporting purposes, and then deliver the packet to the correct receiver.

Layer 2 is the data link layer, which sets the standards for data being delivered across a link or medium. The 1st layer is the physical layer which deals with the physical characteristics of the transmission of data such as the network card and network cable type. An easy way to remember the layers of OSI is to remember All People Seem To Need Data Processing (Layers 7 to 1).

[albertadesoza]

Network topology is the physical interconnection of the elements of a computer network. Broadly there are two kinds of elements in computer networks - node and link. According me Bus Topology is easy to use and to understand. On a typical bus network the cable is just 1 or more wires with no active electronics to amplify the signal or pass it along from computer to computer.

[dhoni]

the topology has commonly used for seven in this bus topology is easy to use in this layer

in this main article is osi model

the bus topology the network as one or more wires to use to get one computer to another computer