Your department has less than 200 people and has been assigned a class C network

Question

Your department has less than 200 people and has been assigned a class C network by its enterprise. The class C network address assigned to you is 214.53.67.0. You need to divide this into three subnets for the administration group, accounts, and development group. Assume the first and last subnets are usable. i) [4 marks] List the network addresses for the subnets in dotted-decimal slash notation. ii) [2 marks] What is the broadcast addresses for these subnets? iii) [2 marks] Give the subnet mask. iii) [1 mark] How many hosts are in each subnet?

Explanation / Answer

Given class C network address is 214.53.67.0
Since it is a class C address, the default is 255.255.255.0 (/24). Now we need to divide this network into 3 subnets for administration group, accounts and development group. So, If we borrow 2 bits from the address as network address , we can form 2^2 = 4 subnets. Each with the subnet mask 255.255.255.192 (/26). We can only use 3 subnets for now and use the remaining one later.
1. So, network addresses of the four subnets are
214.53.67.0/26
214.53.67.128/26
214.53.67.64/126
214.53.67.192/26

2. Broadcast addresses of the 4 subnets are
214.53.67.63
214.53.67.191
214.53.67.127
214.53.67.255

3. Since each subnet has 8-2 = 6. bits available for host (2 bits for network id), the number of available hosts are 2^6 = 64. Usually 2 addresses are reserved for network address and broadcast address. But here problem statement says that first and last hosts are also used. So, number of hosts are 64 for each subnet

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