Computer Networking
Error detecting code is

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
the ratio of the data units in error to the total number of data units
a check bit appended to an array of binary digits to make the sum of all the binary digits.
None of these
an error-detecting code based on a summation operation performed on the bits to be checked

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Computer Networking
A WATS arrangement

is always less expensive than flat-rate service
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
is never less expensive than flat-rate service
None of these
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short

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Computer Networking
You connect a host to a switch port, but the new host cannot log into the server that is plugged into the same switch. What could the problem be?

The router is not configured for the new host.
The VTP configuration on the switch is not updated for the new host.
The host has an invalid MAC address.
The switch port the host is connected to is not configured to the correct VLAN membership.

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