Network Design Proposal Part 2

Network Design Proposal: Part 2

Network Addressing


CMIT 265

For this network design we have been assigned the network address which has a subnet mask of The network design requirements from UMUC requires that the network address 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.

  1. 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 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, and address range of –, and a broadcast address of The chart below shows all 8 subnets by location in the building.

Subnet Network Address Host Address Range Broadcast Address
Classroom 1 –
Classroom 2
Classroom 3 –
Classroom 4 –
Classroom 5 –
Classroom 6
Library Lab –
Office Network –


[1] Mogul, J. and J. Postel (1985) Internet Standard Subnetting Procedure, STD 5, RFC 950, DOI 10.17487/RFC0950, [Online], Avaliable: