Computer Networking
Modulation is the process of

converting digital signals to analog signals
Multiplexing various signals into high speed line signals
performing data encryption.
converting analog signals to digital signals

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Computer Networking
The fundamental requirements of private-to-public network interconnection methods which need to be provided in gateways is/are

A and B both
to assign address to private network DTEs
adequate cost control mechanisms for administration of the private networks
None of these
universal accessibility for private network Data Terminal Equipment (DTE)

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