2. (40 points) Suppose station A tries to send four frames (fo, f1, f2, f3) to station B (there is no frame f4 to send), using the Selective Repeat (SR) ARQ protocol with ws-wr-3. Complete the frame exchange sequence and send/receive window information until all four frames are delivered successfully. Suppose both fO and f1 are lost on the first attempt, while all other frame transmissions (including re-transmitted data frames and ACK/NAK frames) succeed. Suppose that one-way propagation delay is 1.5 time units, and timeout for each frame is twelve time units f0 f1 f2 2. (40 points) Suppose station A tries to send four frames (fo, f1, f2, f3) to station B (there is no frame f4 to send), using the Selective Repeat (SR) ARQ protocol with ws-wr-3. Complete the frame exchange sequence and send/receive window information until all four frames are delivered successfully. Suppose both fO and f1 are lost on the first attempt, while all other frame transmissions (including re-transmitted data frames and ACK/NAK frames) succeed. Suppose that one-way propagation delay is 1.5 time units, and timeout for each frame is twelve time units f0 f1 f2