Subnetting

Subnetting using VLSM

2 Subnet:  i.  Computer centre- 21 hosts (Subnet 1)

      ii. Administration - 5 hosts (Subnet 2)

Assume we use IP address : 192.10.0.0 / 24

 1.Largest Network: Computer Centre

Number of Hosts: 21 hosts

2H - 2 ≥ 21

2H - 2 =  25 - 2 = 32 - 2 = 30 ≥  21

So, H = 5

Subnet mask = 32 - 5 = 27

New subnet mask = /7

Given IP: 192.10.0000 0000. 000x xxxx

IP RANGE FOR COMPUTER CENTRE (SUBNET 1):

Network Number: 192.10.0.0

IP Range: 192.10.0.1 - 192.10.0.30

Broadcast Number: 192.10.0.31

2.Second Largest Network: Administration

Number of Hosts: 5 hosts

2H - 2 ≥ 5

2H - 2 =  23 - 2 = 8 - 2 = 6 ≥  5

So, H = 3

Subnet mask = 32 - 3 = 29

New subnet mask = 29

Given IP: 192.10.0000 0000. 0010 0xxx

IP RANGE FOR ADMINISTRATION (SUBNET 2):

Network Number: 192.10.0.32

IP Range: 192.10.0.33 - 192.10.0.38

Broadcast Number: 192.10.0.39