Question 3 (1.5 points) (This question is related to ILO2a - "be able to explain the principles in providing reliable communication in an unreliable medium".) Two neighboring nodes (A and B) use a sliding window protocol with a 3-bit sequence number space. b) Selective Repeat is used with a window size of 4, and the sequence number is initially set to 0. Again, assume one way data flow only, show all possible window positions of A and B for the following succession of events i. (0.1) Before A sends any frames; ii. (0.2) after A sends frames 0, 1, 2, 3 and receives acknowledgment ACKO and ACK2 from Bi ii. (0.3) after A sends frames 4, 5, 6, 7 and receives acknowledgment ACK5 only before experiencing a timeout (i.e., show the windows of A & B before timeout); iv. (0.2) after the timeout, A receives all acknowledgment(s) that is/are resulted from the retransmission