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Repeater
Repeater is also named as active hub operates at physical layer of OSI model. Repeater is an electronic device that simply regenerates the signal. Signals travelling through a physical wire travel some distance before they become week due to process of attenuation due to interfacing of other signals such as noise with them. For example a signal of 5v may become 4.5 in the process of transmission. A repeater senses with its intelligence and regenerates 5 v signals by recreating the bit pattern of original signal repeater is responsible for strengthening the signal.
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Session layer examples are Netbios Names, SQL, NFS, X Windows, and RPC.
OBJECTIVES After reading this unit, you should be able to: Describe the basics of parallel programming; Explain the parallel programming based on message passing;
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