Can you answer this question by looking questions a and b

At the data link layer of communication between machines A and B, the Go-back-N protocol with a window width of 7 frames is used. Below are the states of the windows of machines A and B (a0 and b0) before sending Frame 2, as well as the frames sent and positiveegative (ACK/NAK) received food is shown in the figure. (a) Show by drawing which frames the windows in a1, b1, a2, b2, a3, b3, a4, and b4 should contain. (b) Write the relationship between the window width (N) and the field length (k) from the bit-type of the frame sequence number.

Note: I will be glad if you can solve it in detail.

Thanks

A Makinesi B Makinesi (a) (b0) (al) (b1) (a) (b) 6 (b5) (b3) 4NAK7 (b4)