A network has 3 subnets - X, Y and Z. There are 65, 21 and 30 hosts

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Question:

A network has 3 subnets - X, Y and Z. There are 65, 21 and 30 hosts present in the X, Y and Z subnets respectively. The subnets share the 24 high-order bits of the 138.32.130.0/24 address space.

Your manager has requested you to calculate subnet addresses to each of the subnets with the following goals -

leave the largest possible contiguous address space available for assignment in case a new subnet were to be added.
the amount of address space assigned is minimal;

Please answer the following questions showing logic and calculations based on the above criteria:

a. What is the theoretical maximum number of hosts allowed here?

b. What are the subnet addresses of subnets X, Y and Z?

c. What are the broadcast addresses of subnets X, Y and Z?

Question 2: Network Address Translation [16 x 0.5 = 8 Marks]

Three computers are connected together in a local network having IP addresses 10.0.1.14, 10.0.1.16 and 10.0.1.19. Between the hosts and the rest of the internet is a NAT-enabled switch/router. The host with IP address 10.0.1.19 sends an IP datagram destined to host 128.119.166.186. The source port is randomly selected as 3368 and the destination port as 80.