$($e$)$ In the context of a simple layer$-2$ error$-$detection scheme,

$($i$)$ Explain how an even parity check scheme is implemented.

$($ii$)$ If a transmitter is transmitting the data $1110001$ and using odd parity, give the

transmitted bits.

$($iii$)$ How is an error detected at the receiver? Give a limitation of parity$-$check error

detection.

$($iv$)$ If $T$ is the $n-$bit frame to transmit; $D$ is the $k-$bit block of data; $F$ is the $n-k-$bit

Frame Check Sequence; and finally, $P$ is the pattern, define the CRC process in

either polynomial or binary form.

$[10$ marks$]$