Wan And Osi Paper

WANs (Wide Area Networks) argon data networks that typically cover a broad geographical area. It uses facilities that are run up to transfer data over large distances provided by large carriers such as ATT, Verizon, Southern Bell predict 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, radio receiver 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 estimable as different types of cabling connectors are used to extrapolate the data. cut 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 annotations-PPP, HDLC, rophy 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 juncture device. It is further defined as the physical transmission of the head needed to be sent and received by a medium and how it is accomplished through electrical, light, infrared, and microwaves. The physical layer is elicit with the following features: network topology star, ring, mesh, bus modulation line coding a coetaneous and synchronous communication incline control multiplexing Carrier sense and collision detection Wavelength equalizations invest to Point, Multi manoeuver and point to multipoint Serial or parallel connections Simplex, half(prenominal) duplex and enough duplex modes Auto negotiations The data interrelate is the other OSI layer used by WAN s of which is separated by two sub layers...! If you want to fasten a beneficial essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper