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: 1) 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] MAC: FL-F1-F1-F3-F1-F1 P. 190.350L2 WC: AA-AA-AA-AA-AA-AA Father 1. 192.168.1.1 Tutti : 192.168.21 F Fade Fall/ F SO Fabys 192.168.2.2 MAC 93-93-03.03-03-05 IP 192.168 MACEE-EE-EE-EE-EE-EE P.192.168.1.1 WC:9-33-88-95-88-36 Fayz Rab 19.30.LS MC-0-0-0-00-00 PC-C 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]