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So when should Ethernet be used as opposed to Token Ring Both have their advantages and disadvantages, both have solid industry support, and both are manufactured by a number of respectable, well-known players. CSMA/CD (for all intents and purposes, Ethernet) is far and away the most widely deployed LAN technology because it is simple, inexpensive, and capable of offering very high bandwidth to any marketplace,
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Figure 4-25 A client-server LAN.
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including residential. I am writing this in my home office on a PC that is connected to a 100-Mbps Ethernet LAN that ties together three PCs and a couple of printers, and the total cost of the network, including the router and firewall that protects the machines from intrusion due to the always-on connection through the cable modem, is less than $200. Most businesses use Ethernet today because most businesses have normal traffic flows office automation traffic and the like. For businesses that experience constant, bandwidth-intensive traffic, such as that found in engineering firms, architectural enterprises, or businesses with other graphics-heavy traffic, Token Ring may be a better choice, although some will argue. Businesses that already have a large installed base of IBM hardware may also be good candidates for Token Ring, since it integrates well (for obvious reasons) into IBM environments. Even still, Ethernet is ruling the roost.
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Another variation on the LAN theme that is experiencing a great deal of attention today is 802.11, the set of standards that address wireless LAN considerations. IEEE 802.11 is a wireless LAN standard developed by the IEEE s 802 committee to specify an air interface between a wireless client and a base station, as well as among a variety of wireless clients. First discussed in 1990, the standard has evolved through six draft versions and won final approval on June 26, 1997.
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802.11 Physical Layer
All 802 standards address themselves to both the Physical (PHY) and MAC layers. At the PHY layer, IEEE 802.11 identifies three options for wireless LANs: diffused infrared, direct sequence spread spectrum (DSSS), and frequency hopping spread spectrum (FHSS). Although the infrared PHY operates at a baseband level, the other two radios operate at 2.4 GHz, part of the Industrial, Scientific, and Medical (ISM) band. The ISM band can be used for operating wireless LAN devices and does not require an end-user license. All three PHYs specify support for 1-Mbps and 2-Mbps data rates.
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802.11 MAC Layer
The 802.11 MAC layer, like CSMA/CD and token passing, presents the rules used to access the wireless medium. The primary services provided by the MAC layer are as follows:
Data transfer Based on a Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) algorithm as the media access scheme. Association The establishment of wireless links between wireless clients and access points (APs). Authentication The process of conclusively verifying a client s identity prior to a wireless client associating with an AP. 802.11 devices operate under an open system where any wireless client can associate with any AP without verifying credentials. True authentication is possible with the use of the Wired Equivalent Privacy Protocol (WEP), which uses a shared key validation protocol similar to that used in Public Key Infrastructures (PKI). Only those devices with a valid shared key can be associated with an AP. Privacy By default, data is transferred in the clear. Any 802.11compliant device can potentially eavesdrop on PHY 802.11 traffic that is within range. WEP encrypts the data before it is transmitted using a 40-bit encryption algorithm known as RC4. The same shared key used in authentication is used to encrypt or decrypt the data; only clients with the correct shared key can decipher the data. Power management 802.11 defines an active mode, where a wireless client is powered at a level adequate to transmit and receive, and a power save mode, under which a client cannot transmit or receive, but consumes less power while in a standby mode of sorts.
802.11 has garnered a great deal of attention in recent months, particularly with the perceived competition from Bluetooth, another shortdistance wireless protocol. Significantly more activity is underway in the 802.11 space, however, with daily product announcements throughout the industry. Various subcommittees have been created that address everything from security to voice transport to quality of service; it is a technology to watch.
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