a) You are given the network address of 172.16.18.0/24 to subnet for the network shown in the topology. Fill in the subnet table below. b) If you are given only one router with one gigabit interface and multiple switches, draw a logical topology to connect the network from N1 to N4 in question 2 a). Then, briefly describes the steps required to allow all PCs from N1 to N4 to ping one another. (Configuration command is not required). (8 marks)