Pipelined protocols $2+3+3$

a$.$ What actions a sender takes upon a time out$($n$)$ event occurs in i$)$ GBN ii$)$ SR

protocols?

b$.$ Consider a sender host in Regina and a receiver in Ottawa are communicating

via a pipelined reliability protocol. What actions will the receiver take upon

receiving an out$-$of$-$order segment if i$)$ receiver has no buffer ii$)$ receiver has buffer

capability?

c$.$ Consider the data transfer between two hosts A and B with the pipelined

technique. A is located on the West Coast of Canada and B is located on the East

Coast. The speed$-$of$-$light round trip propagation delay between A and B$,$ RTT$,$ is

approximately $30$ milliseconds. Suppose that A and B are connected by a channel

with a transmission rate of $3$ Gbps$.$ Given the packet size of $1500$ bytes and the

window size of $5000$ packets, compute the utilization of the sender host A$?$