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?

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

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Computer Networking
Error detecting code is

a check bit appended to an array of binary digits to make the sum of all the binary digits.
a code in which each expression conforms to specify rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
an error-detecting code based on a summation operation performed on the bits to be checked
None of these
the ratio of the data units in error to the total number of data units

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Computer Networking
Bulletin board system

is a public access message system
converts analog signals to digital signals
converts digital signals to analog signals
None of these
is a modem capable of accepting commands

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