PLEASE HURRY, ONLY 45MIN HAVE. PLEASE

ONLY ANS B AND C , PLEASE HURRY

QUESTION 2 [15 Marks] (a) i) Explain the purpose of backoff algorithm in CSMA/CD. [2 marks] ii) Describe one difference between channel partitioning and random access of multiple access protocols. [3 marks] (b) With regards to ARP table, answer the following questions: 1) Refer to Figure 2 below. If Laptop-A has had some communications with all hosts EXCEPT Laptop-B, what will the ARP table of Laptop-A looks like? Draw the ARP table for Laptop-A (you can ignore the TTL). [2 marks] Fa0/1 Laptop-A IP: 192.168.2.5 MAC: F1-F1-F1-F1-F1-F1 Fa0/0 PC-A Router 0/1 IP 192.168.1.2 MAC AA-AA-AA-AA-AA-AA Fao Fa0/4 Fast Ethernet0/0 IP 192.168.1.1 MAC: 01-01-01-01-01-01 Fast Ethernet0/1: IP 192.168.2.1 MAC: 02-02-02-02-02-02 Wireless Routeri P 192.168.2.2 MAC: 03-03-03-03-03-03 Fab Fa0/2 Fa0/3 PC-E IP: 192.168.2.3 MAC: EE-EE-EE-EE-EE-EE SWO Fao/S PCB IP: 192.168.1.3 MAC: BB-88-88-88-88-85 10/1 Fa0/2 Fao Fao SWI Laptop- IP 192.168.1.5 MACDD-DO-DD-DD-DO-DD PC-C IP: 192.168.1.4 MAC: CC-CC-CC-CC-CC-CC Figure 2 11) Explain your answer in (1). [3 Marks] (c) A data of 100100 will be sent to the receiver through a network link. Considering the generator of 1101, generate the data that will be sent by the sending host. Show your workings. [5 Marks]