This is a networking question.

4. Consider sender A and receiver B which communicate using an ARQ protocol. The current window at A is [12, 18] and A receives ACK 16 from B. a. What is the new window of A when A and B implement Go Back N ARQ? Provide an explanation of how you obtained your result. b. What is the new window of A when A and B implement Selective Repeat ARQ? Provide an explanation of how you obtained your result