SSK Software has their main office in Sylvania Ohio and remote locations in Chicago, Toledo, Cleveland and Cincinnati. SSK Software currently has 62 devices connected to the network in Chicago, 30 computers in Toledo, 60 computers in Cleveland, 30 computers in Cincinnati, and 63 computers in Sylvania. It is likely that there will be additional computers added in Sylvania within the year. The IT plan calls for connecting all SSK Software locations using T-1 data lines. The Sylvania site will also connect to the Internet.

SSK Software has elected to use public IP address space on all computers at each of the sites.

The network engineer for their ISP is on vacation. You are asked to perform the network engineering task for this project. You have been restricted to the IP address ranges below. The ISP charges 75? per month for each IP address allotted.

Note: When the ISP supplies the customer with a range of addresses they do not charge for the all zeroes (network address) or all ones (broadcast address) portion of the range provided.

192.168.10.0/24

192.168.11.0/24

192.168.12.0/24

192.168.13.0/24

205.127.135.0/24

205.127.136.0/24

205.125.138.0/24

210.126.137.0/25

225.113.8.0/24

225.113.9.0/24

205.128.135.0/24

205.128.136.0/24

192.168.0.0/16

10.0.0.0/8

205.128.137.0/25

205.128.137.128/25

206.122.148.0/24

a. Based on the above information, what single range of IP addresses would the ISP provide to SSK Software to best meet their needs - include the cost per year of the IP addresses (dollar amount SSK Software must pay to the ISP). Show your work.

b. Using the address range provided by the ISP, propose a Subnetwork plan that will efficiently utilize the IP address space for SSK Software's network needs. Explain your plan and why it follows good network design goals.