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

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

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Computer Networking
The physical layer, in reference to the OSI model, defines

the interface between the X.25 network and packet mode device
None of these
the virtual circuit interface to packet-switched service
All of these
data link procedures that provide for the exchange of data via frames that can be sent and received

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