Networks Design and Management by Steven T. Karris PDF

By Steven T. Karris

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He/she loads a small front−end application on his/her terminal to query the main database server that includes information on airlines and flight information. The database server looks up the flight number, itinerary, and price, and returns the information about it. No processing is done on the travel agent’s terminal. 6 Database Services One major consideration of a networked database is the coordination of multiple changes. All or part of the databases may also be replicated to other servers on a network to distribute the load.

Clients are smaller desktop computers that users use to access network services. • Peer computers act as both clients and servers. • The physical connection between the computers on a network is referred to as the media. • Resources are devices and equipment that clients can have access to. Printers, scanners, and hard disks are examples of resources. • Users are humans that use clients and resources. • Protocols are the written rules for communication between devices on a network. • Centralized processing is done with a large central system with terminals as clients.

Typical LAN Since LANs are contained in small areas, high−speed cable can be used. Also, since the installed media is usually high quality, few to no errors are generated on the network. Prices of LAN equipment are fairly cheap. Network adapters−to be discussed in a later chapter−used in LANs can be found for less than $15 each. 2 Metropolitan Area Networks A Metropolitan Area Network (MAN) is a high−speed network that can carry voice, data, and images at up to 200 Mbps over distances of up to 75 km.

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