Computer Networking
X.21 is

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

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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 many subinterfaces in the same subnet.
Configure a single subinterface to establish multiple PVC connections to multiple remote router interfaces.

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