Computer Networking
MAC is

a very common bit-oriented data link protocol issued to ISO.
network access standard for connecting stations to a circuit-switched network
a method access control technique or multiple-access transmission media
a method of determining which device has access to the transmission medium at any time
None of these

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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

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

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