Subject - Computer Networks

Please answer and explain

Q5 What is the maximum window size for data transmission in Selective Repeat and Go Back N protocol if n bit frame sequence numbers are used? Consider a scenario for Selective Repeat protocol where frames with sequence numbers from 0 to 4 have been transmitted by the sender. Now assume that the following sequence of event occurs: (i) (ii) (iii) (iv) frame ( does time-out A new frame with sequence number 5 is transmitted. frame 1 and frame 2 time-out A new frame with sequence number 6 is transmitted. At every stage show the status of the sender's window i.e. the outstanding frames in the sender's window. Consider another scenario for Go Back N sliding window protocol with window size 3 where sender X needs to send a message consisting of 9 packets to receiver Y. If every 5th packet that sender X transmits gets lost (but no ACKs from receiver Y ever get lost), then how many packets sender X will transmit for sending the message to receiver Y