Assume a wireless network consists of an access point (denoted as X ) and two wireless nodes (denoted as A and B respectively). Assume that wireless nodes A and B cannot hear each other's transmissions, but they can hear X (i.e. X can hear A and B). Suppose - At time 0s,X is sending a packet to some other node and it completes sending this packet at time 100s. - At time 2s, a packet becomes available for transmission at A. A needs 150s to send this packet. - At time 60s, a packet becomes available for transmission at B. B needs 100s to send its packet. - Let the value of the backoff timer for A be 40s and the value of the backoff timer for B be 60s. 1) Sketch the above described topology to include wireless nodes X,A,B, and their coverage. You may use tools such as Word, Paint, Visio, etc. to complete this topology. (5 marks) 2) Analyse the above transmission situation and describe the transmission procedure. In your description, clearly state which node starts to sense and transmit at what time and how long it would take. Start your description from 0 is in the network. Suppose the network only uses CSMA/CA without the RTS/ TS scheme