Computer Networking
X.21 is

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

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Computer Networking
Synchronous protocols

transmit characters one at a time
allow faster transmission than asynchronous protocols do
are more reliable
None of these
are generally used by personal computers

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Computer Networking
How should a router that is being used in a Frame Relay network be configured to keep split horizon issues from preventing routing updates?

Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic.
Configure a separate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface.
Configure a single subinterface to establish multiple PVC connections to multiple remote router interfaces.
Configure many subinterfaces in the same subnet.

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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

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

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