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)
None of these
to assign address to private network DTEs
adequate cost control mechanisms for administration of the private networks
A and B both

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Computer Networking
The network layer, in reference to the OSI model, provide

None of these
the virtual circuit interface to packet-switched service
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received
the interface between the X.25 network and packet mode device

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