DATA LINK LAYER WIRED NETWORKS
DATA LINK CONTROL DLC
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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do not provide a continuous set of values
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represent values as discrete steps
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can utilize decimal or binary systems
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all of the above
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Detailed explanation-1: -A digital signal is a signal that represents data as a sequence of discrete values. A digital signal can only take on one value from a finite set of possible values at a given time. With digital signals, the physical quantity representing the information can be many things: Variable electric current or voltage.
Detailed explanation-2: -Two main types of signals encountered in practice are analog and digital. The figure shows a digital signal that results from approximating an analog signal by its values at particular time instants. Digital signals are quantized, while analog signals are continuous.
Detailed explanation-3: -Continuous Time and Discrete Time Signals. Deterministic and Non-deterministic Signals. Even and Odd Signals. Periodic and Aperiodic Signals. Energy and Power Signals. Real and Imaginary Signals.