QUESTION 2 (15 Marks] (a) i) In Carrier Sense Multiple Access (CSMA), if all nodes do carrier sensing before transmit, briefly explain why does collision still occur ? [2 marks] ii) Describe one difference between random access and taking turns multiple access protocols. [3 marks] (b) With regards to ARP table, answer the following questions: i) When we first boot (switch on) a computer, what is the content of the ARP table? [1 mark] ii) Refer to Figure 2 below. If PC-B has had some communications with all hosts EXCEPT Laptop-A, what will the ARP table of PC-B looks like? Construct the ARP table for PC-B (you can ignore the TTL) with the contents. [4 Marks] Fac Fab/ 140/1 Laptop A IP 192.168.2.5 MAC: F1-F2-F1-F1-F1-F1 PC-A Route 03 P. 192.168.1.2 MAC AA-AA-AA-AA-AA-AA Fa Fab/ Fast Ethernet 10 IP 192.168.1.1 MAC OL-01-01-01-01-01 Fast Ethernet 0/1: 1P 192.168.2.1 MAC 02-02-02-02-02-02 Wireless Router IP 192.168.2.2 MAC: 01-03-03-03-03-03 Fao Fa0/2 Fa0/3 PCE SWO IP 192.168.23 MAC-EE-EE-EE-EE-EE-EE PC-6 P: 192.168.1.3 MAC B8-88-8-8-8-88 Fao! Fa0/2 Fall Fall SWI Laptop IP: 192.168.1.5 MAC. DO OD-DO-OD-DO-OD PC-C P: 192.168.1.4 MAC CC-CC-CC-CC-CC-CC Figure 2 (c) A data of 100100001 was successfully received by the receiving host. Using the CRC technique and Generator of 1101, clarify the error status of the received data. Show all workings. [5 Marks]