POR Francisco is building the network shown in the topology below. He plans to use the network address 172.18.0.0/21 and create subnets minimising wastage of IP addresses. The number of hosts attached to the switches is as shown in the figure except for the VLANs which are as follows: VLAN 1: 10 hosts (Management) VLAN 2: 86 hosts VLAN 3: 180 hosts VLAN 4: 510 hosts Furthermore, all switches will be on the management VLAN and S1 to perform InterVLAN routing. Create a suitable IPv4 addressing scheme which can be used to build the network. 10 marks PCT PCB PCI MANI PC2 YLANZ St PCS VLAD VLAN FTP Server Server