$($Queueing disciplines, $10\%)$

a$)(5\%)$ Suppose that there are two flows sharing one unit of bandwidth. Packet $1$ of

flow $1$ arrives at time $0$ and its packet length is $5($units of bandwidths$),$ i$.$e$.,$ it takes

$5$ units of time to transmit this packet. Packet $2$ of flow $1$ arrives at time $2$ and its

packet length is $6.$ Packet $1$ of flow $2$ arrives at time $1$ and its packet length

is $8.$ Find the packet departure times of these three packets under the fair queueing

policy.

b$)(5\%)$ Consider the same two flows of packets as in the last problem. Suppose that

we assign flow $1$ with a priority higher than flow $2.$ Find the packet departure times

of these three packets under such a priority queue policy.