Q4. 2 marks) i. What is the maximum backoff value for Ethernet CSMA/CD on the 4'th retransmission attempt? ii Suppose two stations have a packet to send and it is the 2"d retransmission attempt for both of them. What is the probability that both stations attempt to transmit in the same slot? Q5. (2 marks) Packets of fixed size 2000 bytes are transmitted using slotted ALOHA over a link of data rate 4 Mbps i. What is the maximum possible throughput in bps (or kbps or Mbps) of the system? ii. What is the maximum possible throughput in packets per second of the system? Use the formula S -G exp(-G), G- offered traffic, S- throughput