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). N1 80 hosts N2 25 hosts PC-PT PCO PC-PT PC1 Network ID 2950-24 Switch0 2950-24 Switch1 Network Address 2911 RouterO N5 2 hosts 2911 Router1 2950-24 Switch2 2950-24 Switch3 First Usable Last Usable Host Host PC-PT PC2 PC-PT PC3 Broadcast Address N3 5 hosts N4 10 hosts Subnet Mask