Computer Networking
Which of the following summation operations is performed on the bits to check an error-detecting code?

Checksum
Codec
Attenuation
Coder-decoder
Broadband and baseband refer to the different frequencies at which infrared operates then transmitting signals in certain conditions

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Computer Networking
X.21 is

network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO
a method access control technique for multiple-access transmission media
None of these
a method of determining which device has access to the transmission medium at any time

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