Q$.4.($a$)$ Explain the importance of Parity Bit Error checking and describe how

this method of error checking function.

$($b$)$ Explain the following terms used in communication networking:

$($i$)$ Bit rate

$($ii$)$ Baud Rate

$($iii$)$ Bandwidth

$($c$)$ List the $7$ layers defined in the ISO OSI Reference Model and state the

functions of each layer.