Computer Networking
X.21 is

network access standard for connecting stations to a circuit-switched network
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued by ISO
a method access control technique for multiple-access transmission media
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

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

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