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

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

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Computer Networking
The packets switching concept was first proposed

in the early 1960s for military communication systems, mainly to handle speech
All of these
None of these
in the late 1950s for Defense Ministry of US
in the late 1980s for the Defense Ministry of US.

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