easy understanding on VLSM.. Stay touch with me....thanks

1. 1
Post prepared by : MD. SHIHAB HOSSAIN. (IDB-BISEW), Cell: 01750006844,
Mail: shihabmsh@live.com
VLSM Short-cut
I hope this post will guide you to calculate VLSM very shortly. Also you don’t have to
remember binary for every number except subnet mask.
I take an IP address, for example: 192.168.100.40 /27
Step 1 : Subnet Mask

2. 2
Post prepared by : MD. SHIHAB HOSSAIN. (IDB-BISEW), Cell: 01750006844,
Mail: shihabmsh@live.com
Step 2 : Network Address and Broadcast Address
Fill first 3 octets with IP Address.

3. 3
Post prepared by : MD. SHIHAB HOSSAIN. (IDB-BISEW), Cell: 01750006844,
Mail: shihabmsh@live.com
Now the first number of the block is Network Address and Last number of block is Broadcast
Address.
Step 3 : Valid IP Range

4. 4
Post prepared by : MD. SHIHAB HOSSAIN. (IDB-BISEW), Cell: 01750006844,
Mail: shihabmsh@live.com
Step 4 : Number of Hosts