Computer Networking
RS-232-G

specifies only the mechanical characteristics of an interface by providing a 25-pin connector
is an interface between two data circuit terminating equipment as examplified by a local and remote modem
requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
None of these
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment

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Computer Networking
What is split horizon?

It holds the regular updates from broadcasting to a downed link.
It splits the traffic when you have a large bus (horizon) physical network.
Information about a route should not be sent back in the direction from which the original update came.
It prevents regular update messages from reinstating a route that has gone down.

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