Problem 7 (10pt) (a) Consider the slotted ALOHA protocol for a time slotted channel. Each packet transmission fits exactly into one time slot. Suppose there are only two stations. For each time slot, station 1 transmits with probability Pi, and station 2 transmits with probability P2. Consider a particular time slot: i. What is the probability that it is empty? [1 pt] what is the probability that it has a collision, i.e., both stations transmit in it? ii, [1 pt] (b) )Describe the RTS-CTS exchange in the IEEE 802.11 CSMA/CA protocol. 12pt] (ii) Why RTS-CTS is better than letting the data packets collide in the channel? [2 pts] (a) What is the difference between an Ethernet (MAC) address and an IP address in length? What is the key conceptual difference between an Ethernet (MAC) address and an IP address? In particular, if a desktop machine (with an Ethenet card) is moved from one network to another, will its IP address change? Will its Ethernet address change?[+1+1+1 pts]