Computer Networking
The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to

0.009
0.991
0.999
0.003
None of these

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Computer Networking
RS-232-G

None of these
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
is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
requires only 7 pin out of 25 in order to transmit digital data over public telephone lines

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Computer Networking
What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?

Forwards the switch to the first available link
Floods the network with the frame looking for the device
Sends back a message to the originating station asking for a name resolution
Drops the frame

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