The Handbook of Computer Networks, LANs, MANs, WANs, the by Hossein Bidgoli

By Hossein Bidgoli

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Extra info for The Handbook of Computer Networks, LANs, MANs, WANs, the Internet, and Global, Cellular, and Wireless Networks

Example text

Network operating systems typically include drivers for most network adapters so that the adapter can be plugged into the computer and the computer can be functioning on the network without too much additional configuration. Network application software includes client front end software that is specific for use by client computers. This would include programs like Web browsers and e-mail software clients that would be run when needed. Hosts functioning as servers would have server software that would be constantly running waiting for connections from clients.

If the medium is busy, continue to listen until it is idle, then transmit immediately. 3. If a collision is detected during transmission, transmit a brief jamming signal to assure that all stations know that there has been a collision and then cease transmission. 4. After transmitting the jamming signal, wait a random amount of time, referred to as the backoff, then attempt to transmit again (repeat from step 1). Figure 2 illustrates the technique. The upper part of the figure shows a bus LAN layout.

Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the bus. A transmission from any station propagates the length of the medium in both directions and can be received by all other stations. At each end of the bus is a terminator, which absorbs any signal, removing it from the bus. Two problems present themselves in this arrangement. First, because a transmission from any one station can be received by all other stations, there needs to be some way of indicating for whom the transmission is intended.

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