Explain the following terms: (1) Unilateral network (2) Bilateral network

Explain the following terms: (1) Unilateral network (2) Bilateral network
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Unilateral network: It is a network whose properties or characteristics change with the direction of its operation. Eg: Network consisting of Diode. Current flows in only one direction. 

Bilateral network: It is a network whose properties or characteristics are same in both directions. In this network impedance is same in both directions. Eg: All resistive networks.
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