Network Design Proposal: Part 2
Network Addressing
UMUC
CMIT 265
For this network design we have been assigned the network address 199.1.2.0 which has a subnet mask of 255.255.255.0. The network design requirements from UMUC requires that the network address 199.1.2.0 be broken up into 8 subnets. Creating subnets will improve the security of the network, it will create smaller collision and broadcast domains, and allow for greater administrative control over the domain [1]. Basically subnetting will help traffic move along the network with fewer chances of packet collisions. By putting a different subnet on in each computer lab, in the offices and in the library this will help the administrators troubleshoot the network. If a problem is reported in a specific computer lab of office the network administrators will immediately know which subnet is having the problem.
- Subnetting
This network will be broken into 8 subnets with at least 25 host on each subnet. A simple method for doing this is by using the “Happy Chart”. I actually added a row to the chart to make it a little easier.
| # of Subnets | 2 | 4 | 8 | 16 | 32 | 64 | 128 | 256 |
| Mask | 128 | 192 | 224 | 240 | 248 | 252 | 254 | 255 |
| Bit | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Bit Value | 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
Basically using the chart and the information we have from the network requirements we know that we need 8 subnets with at least 25 host per subnet. Using the chart, we can see that if we need 8 subnets than that will give us a new subnet mask of 255.255.255.224. Each subnet will be broken up in the 32 address sections with the first address being the subnet network address and the last bit being the subnets broadcast address and every section in between being a potential host address. For example, the first subnet will have a network address of 199.1.2.0, and address range of 199.1.2.1 – 199.1.2.30, and a broadcast address of 199.1.2.31. The chart below shows all 8 subnets by location in the building.
| Subnet | Network Address | Host Address Range | Broadcast Address |
| Classroom 1 | 199.1.2.0 | 199.1.2.1 – 199.1.2.30 | 199.1.2.31 |
| Classroom 2 | 199.1.2.32 | 199.1.2.33- 199.1.2.62 | 199.1.2.63 |
| Classroom 3 | 199.1.2.64 | 199.1.2.65 – 199.1.2.94 | 199.1.2.95 |
| Classroom 4 | 199.1.2.96 | 199.1.2.97 – 199.1.2.126 | 199.1.2.127 |
| Classroom 5 | 199.1.2.128 | 199.1.2.129 – 199.1.2.158 | 199.1.2.159 |
| Classroom 6 | 199.1.2.160 | 199.1.2.161- 199.1.2.190 | 199.1.2.191 |
| Library Lab | 199.1.2.192 | 199.1.2.193 – 199.1.2.222 | 199.1.2.223 |
| Office Network | 199.1.2.224 | 199.1.2.225 – 199.1.2.254 | 199.1.2.255 |
Reference:
[1] Mogul, J. and J. Postel (1985) Internet Standard Subnetting Procedure, STD 5, RFC 950, DOI 10.17487/RFC0950, [Online], Avaliable: http://www.rfc-editor.org/info/rfc950
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