Computer Networking
What frequency range is used for FM radio transmission?

High Frequency : 3 MHz to 30 MHz
Low Frequency : 30 kHz to 300 kHz
None of these
Very High Frequency : 30 MHz to 300 MHz
Very Low Frequency : 3 kHz to 30. kHz

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Computer Networking
RS-449/442-A/423-A is

a code in which each expression conforms to specific 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 number of data units in error to the total number of data units
None of these
a set of physical layer standards developed by EIA and intended to replace RS-232-
a check bit appended to an array of binary digits to make the sum of the all the binary digits

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Computer Networking
Two computers that communicate with each other use a simple parity check to detect errors for ASCII transmissions. Which of the following events will always lead to an undeleted error?

two bits or any even number of bits inverted in a byte during transmission
one bit or any odd number of bits inverted in a byte during transmission
one bit or any odd number of bits inverted in a block of data during transmission
two bits or any even number of bits inverted in a block during transmission
None of these

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