Networking VLSM

Need some help with sub-netting questions using VLSM.

Use subnet 0 in all answers.

(a) Given the network 140.50.0.0/16:

(i) Create a subnet mask for 400 subnets with the maximum possible number of hosts in each subnet

(ii) find the address of the 250th subnet

(iii) VLSM the network address calculated in part (ii) above for as many sub-networks as possible, with no more than 14 usable hosts in each sub-network. Show the subnet mask used.

Show and explain all your working along with your answers.

(b) Create a suitable route summarised (aggregated) address and subnet mask for the following networks:

192.168.74.0/16

192.168.75.0/16

192.168.76.0/16

192.168.77.0/16

192.168.78/0/16

Show and explain all your working along with your answer.