Computer Networking
RS-232-G

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

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Computer Networking
TCP is:

Connection orientated and reliable
Operates at the Data Link layer
None of these
Connectionless and unreliable
Connection orientated and unreliable

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