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Figure 4-21 Using a bridge to segment a LAN.
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In LAN switching, the filter/forward database is distributed; that is, a copy of it exists at each port, which implies that different ports can make simultaneous traffic-handling decisions. This enables the LAN switch to implement full-duplex transmissions, reduce overall throughput delays, and in some cases implement per-port rate adjustments. The first 10-Mbps Ethernet LAN switches emerged in 1993, followed closely by Fast Ethernet (100-Mbps) versions in 1995 and Gigabit Ethernet (1,000-Mbps) switches in 1997. Fast Ethernet immediately stepped up to the marketplace bandwidth challenge and was quickly accepted as the next generation of Ethernet. LAN switching also helped to propagate the topology called star wiring. In a star-wired LAN, all stations are connected by wire runs back to the LAN switch or a hub that sits in the geographical center of the network, as shown in Figure 4-22. Any access scheme (contention-based or distributed polling) can be implemented over this topology, because it defines a wiring plan, not a functional design. Because all stations in the LAN are connected back to a center point, management, troubleshooting, and administration of the network is simplified. Contention-based LANs are the most commonly deployed LAN topologies. Distributed polling environments, however, do have their place.
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In addition to the gladiatorial combat approach to sharing access to a transmission facility, a more civilized technique is known as distributed
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Figure 4-22 LAN switching.
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polling or, as it is more commonly known, token passing. IBM s tokenpassing ring is perhaps the best known of these products, followed closely by the Fiber Distributed Data Interface (FDDI), a 100-Mbps version occasionally seen in campus and metropolitan area networks (MANs), although the sun seems to be setting on FDDI. In token-passing LANs, stations take turns with the shared medium, passing the right to use it from station to station by handing off a token that gives the bearer the one-time right to transmit while all other stations remain quiescent (thus, the Harvard approach). This is a much fairer way to share access to the transmission medium than CSMA/CD because although every station has to wait for its turn, it is absolutely guaranteed that it will get that turn. These systems are therefore characterized by bounded delays, because any station will only have to wait for the token for a certain amount of time. Token-passing rings work as shown in Figure 4-23. When a station wants to transmit a file to another station on the LAN, it must first wait for the token, a small and unique piece of code that must be held by a station to validate the frame of data that is created and transmitted. Let s assume for a moment that a station has secured the token because a prior station has released it. The station places the token in the appropriate field of the frame it builds (actually, the medium access control [MAC] scheme, which is implemented on the NIC card that builds the frame), adds the data and address, and transmits the frame to the next station on the ring. The next station, which also has a frame it wants to send, receives the frame, notes that it is not the intended recipient, and also notes that the token is busy. It does not transmit, but instead passes the frame of data from the first station on to the next station. This process continues, station by station, until the frame arrives at the intended recipient on the ring. The recipient validates that it is the intended recipient, at which time it makes a copy of the received frame, sets a bit in the frame to indicate that it has been successfully received,
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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