On a communication line, the velocity of propagation is $100000$

m$/$s$,$ its length is $10$ km and the data rate is $1000$ Mbps$.$ Using circuit

switching technology, the number of bits that should be transmitted in

a time slot to achieve a line efficiency of $90\%$ is:

$($a$)104($b$)105($c$)108($d$)$ neither a$,$ b or c

$($a$)($b$)($c$)($d$)$

$7)$ Two nodes A and B in a local area network $($LAN$)$ transmit frames

of $1000-$bits. The transmission time and the propagation time

between two nodes is $0\mathrm{.}01$ ms and $0\mathrm{.}495$ ms respectively.

If the stop$-$and$-$wait flow control protocol is used between nodes A

and B$,$ the maximum line utilisation will be:

$($a$)9\%($b$)10\%($c$)90\%($d$)1\%$