$1.$ Consider the sentinel method, which is used to construct a frame. What is the purpose of bit stuffing?

$2.$ On slide$-7,$ why is bit$-$stuffing not required?

$3.$ For protocols such as stop$-$and$-$wait, why does the sender need a timeout?

$4.$ Referring to slide$-21,$ why does the receiver discard frame $2$ and $3?$

$5.$ In Go$-$Back$-$N$,$ the sliding window at the sender determines $($True$/$False$)$:

a$.$ The number of frames in the channel

b$.$ The number of frames that can be sent by the sender

c$.$ Which frames have been acknowledged and yet to be transmitted.

$6.$ A sender$$s sliding window covers new frames to be transmitted after receiving an $\_\_\_.$

$7.$ If a sender uses a large timeout value, what happens to throughput?

$8.$ What does the receiver$$s window keep track of$?$ What is an advantage of having a receive window

that includes multiple frames?

$9.$ What is an advantage of using a negative ACK?

$10.$ Why does Go$-$Back$-$N have a higher throughput than Stop$-$n$-$Wait?

$11.$ In Hybrid$-$ARQ, why is it important to reduce the number of retransmissions?