Example 3: Classless Inter-Domain Routing (CIDR) (Super-netting)

Question:

Example 3

Answer:

v  We Need 3000 Host

v  Class – B is enough to get 3000 Host (We can Choose Class-A Also)

Calculating Host's

So 10 Bit is Enough to get 1000 Host

Sub-netting

1^st Subnet: (Vlan X)

1st Subnet

Network ID            : 172.16.4.0

1^st 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

2^nd Subnet: (Vlan Y)

2nd Subnet

Network ID            : 172.16.8.0

1^st Host ID             : 172.16.8.1

Last Host ID                : 172.16.11.254

Broadcast ID               : 172.16.11.255

Subnet Mask               : 255.255.252.0

3rd Subnet: (Vlan Z)

3rd Subnet

Network ID            : 172.16.12.0

1^st Host ID             : 172.16.12.1

Last Host ID              : 172.16.15.254

Broadcast ID             : 172.16.15.255

Subnet Mask             : 255.255.252.0