A corporate has asked you to restructure their single LAN network into small LANs. The corporate has 5 departments: HR, production, finance, marketing and IT. The number of employees in each department is: - HR: 3 employees, each has a desktop - Production: 6 employees, each has a desktop as well as a work laptop - Finance: 4 employees, each has a desktop - Marketing: 4 employees, each has a laptop - IT: 2 employees, each has a laptop The corporate also has a small data centre that connects 10 servers for: secure website, email, file sharing, mapping FQDNs to IP addresses and dynamic hosts configuration. You are given: address range 172.16.1.0/24, six switches each with 24 ports (Fa0/1 Fa0/24), one router with 7 interfaces (G0/0 G0/6), one Internet connection and all other necessary cables. All inter-department cabling is already set. You are asked to assign the last usable IP address in any of the small LANs to the default gateway of that LAN, and dedicate port Fa0/1 in each switch to the connection with the router. It is preferable (not a requirement) that your design incurs minimum wastage in IP addresses. (a) Assign a subnet for each department and the data centre from the given address range. Provide for each subnet: the subnet address, the subnet mask, the first assigned address, the last assigned address and the default gateway address. [15%] (b) How many IP addresses will not be used in each LAN after subnetting? (c) Draw a topology diagram of your network solution and label each subnet with: subnet name, subnet address (including prefix length), subnet hosts, switch port and default gateway port connected to each other and default gateway address. [15%] (d) State the application layer protocols running in the data centre for each type of server. [5%] (e) The servers in data centre can suffer from a number of vulnerabilities and security attacks. State two types of network attacks that the servers can be targeted for with 1-2 lines definition of each attack. Describe with additional 1-2 lines two solutions that can be applied to mitigate those attacks.