In sliding window flow control window size of 7 an ACK 3 mea

In sliding window flow control (window size of 7), an ACK 3 means the receiver next expects frame_____.

Solution

if the Reciever sends ACK \'i\' then it indicates that Frame i has an error

Then the reciver willnot allow any incoming frames untill the error frame is retransmitted

In that case if the Sender recieves ACK \'i\' it will retransmit the I^th frame and sent all the remaining frames after the i^th frame.

When ACK3 is send by receiver then frames 4,5,6,7,.... n are discarded