Basic question about network

1.What is primary purpose of a LAN ?<br /> - The primary purpose of LAN is to allow resource sharing. The resources may be devices, application, or information. Examples of shared resources are files, database, email, modem, printer.<br /> 2.What is protocol ?<br /> -  A protocol is an agreed-upon set of rules. In data communications, the rules usually gorvern a procedure or a format.<br /> 3. What is the purpose of a MAC protocol?<br /> - A Media Access Control protocol defines how a give LAN medium is shared, how LAN devices connected to the medium are indentified, and how frames transmiited onto the medium are formatted.<br /> 4. What is a frame ?<br /> A frame is a digital "envelope" that provides the information necessary for the delivery of data<br />  across a data link. Typical components of a frame are identifiers (addresses) of the source and<br />  destination devices on the data link, an indicator of the type of data enclosed in the frame, and<br /> error-checking information.<br /> 5:    What feature is common to all frame types?<br /> <br />  A:    A feature common to all frame types is a format for identifying devices on the data link.<br /> <br />  6:    What is a MAC address or MAC identifier?<br /> <br />  A:    A Media Access Control address or identifier is a means by which individual devices connected to<br />        a data link are uniquely identified for the purpose of delivering data.<br /> <br />  7:    Why is a MAC address not a true address?<br /> <br />  A:    An address specifies a location. A MAC address is not a true address because it is permanently<br />        associated with the interface of a specific device and moves whenever the device moves. A MAC<br />        identifies the device, not the location of the device.<br /> <br />  8:    What are the three sources of signal degradation on a data link?<br /> <br />  A:    The three sources of signal degradation on a data link are attenuation, interference, and distortion.<br />        Attenuation is a function of the resistance of the medium. Interference is a function of noise<br />        entering the medium. Distortion is a function of the reactive characteristics of the medium, which<br />        react differently to different frequency components of the signal.<br /> <br />  9:    What is the purpose of a repeater?<br /> <br />  A:    A repeater is a device that extends the useful range of a physical medium by reading a degraded<br />        signal and producing a "clean" copy of the signal.<br /> <br /> <br /> <br /> <br />

Basic question about network

1.What is primary purpose of a LAN ? - The primary purpose of LAN is to allow resource sharing. The resources may be devices, application, ...

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