4. Packet Transmission on LAN Below is a small LAN that includes wired and wireless computers attached to an Ethernet backbone. Please give all of the MAC addresses (abbreviated as A, B, C, D. X and Y for the hosts and AP 1 and AP2 for the Access Points ) for all of the packet headers needed to send the following messages. (For a wired packet, list two addresses: dst and src, for a wireless packet list three addresses: destination, source, and "left-over"). (just an example): Your answers can look like this 802.11 frame: dst=A src=B leftover=C 802.3 frame: dst=A src=B LAN Backbone Wireless "cell" Wireless "cell" a. Computer X sends a message to Computer Y: What devices hear this transmission? b. Computer A sends a message to Computer X: What devices hear this transmission? c. Computer B sends a message to Computer C (try to think through what happens): computer B goes to access point , then us the mi to LAN back bone and goes through Access point 2 to computer What devices hear this transmission? d. Computer Y sends a message to Computer D: What devices hear this transmission