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definition leaves a lot of questions unanswered What is the cable made of How long can it be How do the machines decide which machine should send data at a specific moment A network based on a bus topology can answer these questions in a number of different ways Most techs make a clear distinction between the logical topology of a network how the network is laid out on paper, with nice straight lines and boxes and the physical topology The physical topology describes the typically messy computer network, with cables running diagonally through the ceiling space or snaking their way through walls If someone describes the topology of a particular network, make sure you understand whether they re talking about the logical or physical topology Over the years, manufacturers and standards bodies created several specific network technologies based on different topologies A network technology is a practical application of a topology and other critical technologies to provide a method to get data from one computer to another on a network These network technologies have names like Ethernet and Token Ring, which will be discussed later in this chapter
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Data is moved from one PC to another in discrete chunks called packets or frames The terms packet and frame are interchangeable Every NIC in the world has a built-in identifier, a binary address unique to that single network card, called a media access control (MAC) address You read that right every network card in the world has its own unique MAC address! The MAC address is 48 bits long, providing more than 281 trillion MAC addresses, so there are plenty of MAC addresses to go around MAC addresses may be binary, but we represent them using 12 hexadecimal characters These MAC addresses are burned into every NIC, and some NIC makers print the MAC address on the card Figure 213 shows the System Information utility description of a NIC, with the MAC address highlighted Hey! I thought we were talking about packets Well, we are, but you need to understand MAC addresses to understand packets All the many varieties of packets share certain common features (Figure 214) First, packets contain the MAC address of the network card to which the data is being sent Second, they have the MAC address of the network card that sent the data Third is the data itself (at this point, we have no Figure 213 MAC address
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Even though MAC addresses are embedded into the NIC, some NICs will allow you to change the MAC address on the NIC This is rarely done
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idea what the data is certain software handles that question), which can vary in size depending on the type of frame Finally, some type of data check such as a cyclic redundancy check (CRC) is performed and information is stored in the packet to enable the receiving network card to verify if the data was received in good order This discussion of packets raises the question, how big is the packet Or more specifically, how much data do you put into each packet How do you ensure that the receiving PC understands the way that the data was broken down by the sending machine and can thus put the pieces back together The problem in answering these questions is that they encompass so many items When the first networks were created, everything from the frames to the connectors to the type of cable had to be invented from scratch To make a successful network, you need the sending and receiving PCs to use the same hardware protocol A hardware protocol defines many aspects of a network, from the topology, to the packet type, to the cabling and connectors used A hardware protocol defines everything necessary to get data from one computer to another Over the years, many hardware protocols have been implemented, with names like Token Ring, FDDI, and ARCnet, but one hardware protocol dominates the modern PC computing landscape: Ethernet Token Ring contended with Ethernet for many years but has somewhat faded from the mainstream A consortium of companies centered on Digital Equipment, Intel, and Xerox invented the first network in the mid-1970s More than just creating a network, they wrote a series of standards that defined everything necessary to get data from one computer to another This series of standards was called Ethernet , and it is the dominant standard for today s networks Ethernet comes in three main flavors defined by cabling type: coaxial, unshielded twisted pair, and fiber optic Because all flavors of Ethernet use the same packet type, you can have any combination of hardware devices and cabling systems on an Ethernet network and all the PCs will be able to communicate just fine In the early 1980s, IBM developed the Token Ring network standard, again defining all aspects of the network but using radically different ideas than Ethernet Token Ring networks continue to exist in some government departments and large corporations, but Ethernet has a far larger market share Because Token Ring networks use a different structure for their data packets, special equipment must be used when connecting Token Ring and Ethernet networks You ll read about Token Ring later in this chapter; focus on Ethernet for the moment
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