Wan And Osi Paper

WANs (Wide Area Networks) argon data networks that typically cover a broad geographical area. It uses facilities that are draft up to transfer data over large distances provided by large carriers such as ATT, Verizon, Southern Bell howl and many others in contrast with LANs that are localized and unremarkably self-contained and operator owned. They use copper wire, fiber optics, infrared, microwave, laser, radiocommunication 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 earphone as different types of cabling connectors are used to extrapolate the data. shut in 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 works-PPP, HDLC, capture Switching-ISDN and Dial-up Packet Switching-(Frame Relay, LAPB and X.25) Figure 1. 1 courtesy of wansupportnetworking.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 unification device.

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

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