Consider the following block code:

where D$0-$D$14$ are data bits, P$0-$P$2$ are row parity bits and P$3-$P$7$ are column

parity bits. We assume an even parity strategy.

$($i$)$ If D$0$ D$1$ D$2...$ D$13$ D$14=01010,01001,10001,$ compute P$0$

through P$7.$

$($ii$)$ Now we receive the four following code words:

For each of received code words, indicate the number of errors. If there are

errors, indicate if they are correctable, and if they are, what the correction

should be$.$

$[3$ Marks$]$

$[14$ Marks$]$

$($b$)$ Consider building a CSMA$/$CD network running at $1$ Gbps over a $1-$km

cable with no repeaters. The signal speed in the cable is $200,000$ km$/$sec$.$

What is the minimum frame size?

$($c$)$ Most TCP algorithms assume that timeouts are caused by congestion. Why

is this a problem when transmitting TCP connections over wireless channels?