Computer Networking
What is the main reason the OSI model was created?

So different networks could communicate.
So application developers can change only one layer's protocols at a time.
So Cisco could use the model.
To create a layered model larger than the DoD model.

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

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

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