Example 1:
 |
| Example |
v We need Extra
4 Hosts to Connect Two Routers
i.e.Head Office to Branch 1 – 2 Host’s
Head Office to Branch 2 – 2 Host’s
i.e.Head Office to Branch 1 – 2 Host’s
Head Office to Branch 2 – 2 Host’s
 |
| Host Order Selection |
v So Totally
we need 6 Subnets
v Important
to write Hosts in Descending Order
v If we
Choose CIDR, we Lost lot of IP’s
Ex: in Vlan
1, 100 Host needed. So Remaining 155 Waste. So we Choose VLSM
Vlan 4: (1000 Host)
 |
| Calculating Host's |
So 10 bit's is enough to get 1000 host's
 |
| 0th Subnet |
v We Never Use 0th Subnet
 |
| Vlan-4 Subnet |
Network ID : 172.16.4.0
1st Host ID : 172.16.4.1
Last Host ID : 172.16.7.254
Broadcast ID : 172.16.7.255
Subnet Mask : 255.255.252.0
Vlan 2: (500 Host)
 |
| Calculating Host's |
- So 9 bit's is enough to get 500 host's
 |
| Vlan-2 Subnet |
- We Put '1' in 4th bit Because Current Network ID is next IP of Last Vlan Broadcast ID
Network ID: 172.16.8.0
1st Host ID: 172.16.8.1
Last Host ID: 172.16.9.254
Broadcast ID: 172.16.9.255
Subnet Mask: 255.255.254.0
Vlan 3: (200 Host)
 |
| Calculating Host's |
- So 8 bit's is enough to get 200 host's
 |
| Vlan-3 Subnet |
- Current Network ID is next IP of Last Vlan Broadcast ID
Network ID: 172.16.10.0
1st Host ID: 172.16.10.1
Last Host ID: 172.16.10.254
Broadcast ID: 172.16.10.255
Subnet Mask: 255.255.255.0
Vlan 1: (100 Host)
 |
| Calculating Host's |
- So 7 bit's is enough to get 100 host's
 |
| Vlan-1 Subnet |
- Current Network ID is next IP of Last Vlan Broadcast ID
Network ID: 172.16.11.0
1st Host ID: 172.16.11.1
Last Host ID: 172.16.11.126
Broadcast ID: 172.16.11.127
Subnet Mask: 255.255.255.128
Head to Br1: (2 Hosts)
 |
| Calculating Host's |
- If We Select 1 Bit,then We Can't Get 2 Host IP's, So Take 2 Bits as a Host.
For Example We will try to Calculate Host by taking 1 Bit
 |
| Calculating Host's by using 1 Bit |
- Finally We Can't Get 2 Host's
- So We Will Select 2 Bit's to Get 2 Host's
 |
| Calculating Host's by using 2 Bit's |
Network ID: 172.16.11.128
1st Host ID: 172.16.11.129
Last Host ID: 172.16.11.130
Broadcast ID: 172.16.11.131
Subnet Mask: 255.255.255.252
Head to Br2: (2 Hosts)
 |
| Calculating Host's |
Network ID: 172.16.11.132
1st Host ID: 172.16.11.133
Last Host ID: 172.16.11.134
Broadcast ID: 172.16.11.135
Subnet Mask: 255.255.255.252
