Question: how to vlsm a network?
Answer: Step - 1. Make a list of Subnets possible.
Step - 2. Sort the requirements of IPs in descending order (Highest to Lowest). ... 
Step - 3. Allocate the highest range of IPs to the highest requirement, so let's assign 192.168. ... 
Step - 4. Allocate the next highest range, so let's assign 192.168. ... 
Step - 5. ... 
Step - 6.