Wan And Osi Paper

WANs (Wide Area Networks) argon data networks that typically cover a broad geographical argona. It uses facilities that are soak up up to transfer data over large distances provided by large carriers such as ATT, Verizon, Southern Bell wawl and many others in contrast with LANs that are localized and normally self-contained and operator owned. They use copper wire, fiber optics, infrared, microwave, laser, wireless cell responders and satellites to deliver and receive the data. In most cases a combination of many of these mediums are used of which routers, bridges, repeaters, hubs as bottom as different types of cabling connectors are used to extrapolate the data. inset 1.1 shows a WAN using the internet cloud as the connection. (2009, Pandari nath.Vallarapu) The three types of WAN types used are (Tripod, 2011): Leased line of businesss-PPP, HDLC, lot Switching-ISDN and Dial-up Packet Switching-(Frame Relay, LAPB and X.25) Figure 1.1 courtesy of wa nsupportnetworking.com 1.The WAN uses two sometimes three of the seven seams of the OSI (Open Systems Interconnection) model called the media layers of which the bottom three are used starting with the physical layer defined as the means by which the data is transferred by a conjunction device.

It is further defined as the physical transmission of the taper needed to be sent and received by a medium and how it is accomplished through electrical, light, infrared, and microwaves. The physical layer is raise with the following features: network topology star, ring, mesh, bus modulation line cod ing a coetaneous and synchronous communicat! ion rate of flow control multiplexing Carrier sense and collision detection Wavelength equalizations power point to Point, Multi manoeuver and point to multipoint Serial or parallel connections Simplex, half duplex and enough duplex modes Auto negotiations The data tie is the other OSI layer used by WANs of which is separated by two sub layers...If you want to exhaust a beneficial essay, order it on our website: OrderCustomPaper.com

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