By Steven T Karris,NetLibrary, Inc.
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Extra info for Networks: design and management
We defined file services, print services, message services, directory services, application services, and database services. We concluded the chapter with the definitions and characteristics of LANs, MANs, and WANs. A review of concepts and definitions follows. • A telecommunications network or telephone network, is a group of telephones and associated devices such as answering machines and faxes that are connected by communications facilities. A telephone network can involve permanent connections, such as telephone wires and trunks, cables, or temporary connection made through telephone or other communication links.
The client and server machines work together to accomplish the processing of the application being used. • Fault tolerance is the ability of a computer or an operating system to respond to a catastrophic event or fault, such as a power outage or a hardware failure, in a way that ensures that no data is lost and any work in progress is not corrupted. • Tandem processors are multiple processors wired so that the failure of one processor transfers CPU operation to another processor. We can use tandem processors to implement fault−toler- ant computer systems.
Collisions can still occur by devices transmitting at the exact same time, or transmitting before another device’s signal reaches the other end of the physical media. The CSMA/CD protocol was used in earlier Ethernet† designs. However, CSMA/CD is not used in the 10 Gigabit Ethernet which uses a switched full duplex system offering higher performance. 8 CSMA/CA CSMA/CA is an acronym for Carrier Sense Multiple Access with Collision Avoidance. This network protocol uses a different method of avoiding collisions.
Networks: design and management by Steven T Karris,NetLibrary, Inc.