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When the first network designers sat down at a caf to figure out a way to enable two or more PCs to share data and peripherals, they had to write a lot of details on little white napkins to answer even the most basic questions The first big question was: How It s easy to say, Well, just run a wire between them! Although most networks do manifest themselves via some type of cable, this barely touches the thousands of questions that come into play here Here are a few of the big questions:
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How will each computer be identified If two or more computers want to talk at the same time, how do you ensure all conversations are understood What kind of wire What gauge How many wires in the cable Which wires do which things How long can the cable be What type of connectors If more than one PC accesses the same file, how can they be prevented from destroying each other s changes to that file How can access to data and peripherals be controlled
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Clearly, making a modern PC network entails a lot more than just stringing up some cable! Most commonly, you have a client machine, a PC that requests information or services It needs a network interface card (NIC) that defines or labels the client on the network A NIC also helps break files into smaller data units, called packets , to send across the network, and it helps reassemble the packets it receives into whole files Second, you need some medium for delivering the packets between two or more PCs most often this is a wire that can carry electrical pulses; sometimes it s radio waves or other wireless methods Third, your PC s operating system has to be able to communicate with its own networking hardware and with other machines on the network Finally, modern PC networks often employ a server machine that provides information or services Figure 211 shows a typical network layout This section of the chapter looks at the inventive ways network engineers found to handle the first two of
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Figure 211
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A typical network
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21: Local Area Networking
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the four issues After a brief look at core technology, the chapter dives into four specific types of networks You ll dig into the software side of things later in the chapter
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Topology
If a bunch of computers connect together to make a network, some logic or order must influence the way that they connect Perhaps each computer connects to a single main line that snakes around the office Each computer might have its own cable, with all the cables coming together to a central point Or maybe all the cables from all the computers connect to a main loop that moves data along a track, picking up and dropping off data like a circular subway line A network s topology describes the way that computers connect to each other in that network The most common network topologies are called bus, ring, star, and mesh Figure 212 shows the four types: a bus topology , where all computers connect to the network via a main line called a bus cable; a ring topology , where all computers on the network attach to a central ring of cable; a star topology , where the computers on the network connect to a central wiring point (usually called a hub); and a mesh topology , where each computer has a dedicated line to every other computer Make sure you know these four topologies! If you re looking at Figure 212 and thinking that a mesh topology looks amazingly resilient and robust, it is at least on paper Because every computer physically connects to every other computer on the network, even if half the PCs crash, the network still functions as well as ever (for the survivors) In a practical sense, however, implementing a true mesh topology network would be an expensive mess For example, even for a tiny network with only 10 PCs, you would need 45 separate and distinct pieces of cable to connect every PC to every other PC What a mesh mess! Because of this, mesh topologies have never been practical in a cabled network While a topology describes the method by which systems in a network connect, the topology alone doesn t describe all of the features necessary to make a cabling system work The term bus topology, for example, describes a network that consists of some number of machines connected to the network via the same piece Clockwise from top left: bus, ring, mesh, and star topologies of cable Notice that this
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