SUPERNETTING3.1 # UNDERSTAND AND EXPLAINED OF SUPERNETTING WITH EXAMPLE
Supernetting, also known as classless inter-domain routing (CIDR), is a method used in IP networking to aggregate multiple contiguous IP address ranges into a single, larger address block. This helps optimize routing tables and improves the efficiency of IP address allocation. In supernetting, a network administrator can combine several smaller subnets into a single supernet, which reduces the number of entries in routing tables and minimizes the overhead on routers. For example, instead of announcing several /24 networks, a single /22 supernet can be used to represent those networks. This approach is especially useful in conserving IP addresses and managing network routing more effectively, particularly as the Internet continues to grow.
PROPERTIES :
o Number of network unlimited on it.
o Number of IP limited on it.
o Its barrow from Left hand side.
PRACTICAL :
Network number: 200.10.20.20
Number of subnet required is 5 and subnet =?
| NETWORK | 200 | 10 | 20 | 20 |
| SUBNET MASK | 255 | 255 | 255 | 0 |
| NETWORK | 11001000 | 00001010 | 00010100 | 00010100 |
| SUBNET MASK | 11001000 | 00001010 | 00010100 | 00010100 |
| And Operation | 11001000 | 00001010 | 00010100 | 00000000 |
| Network Address | 200 | 10 | 20 | 0 |
=> 2 range to power 1 – 2 = 0 (False)
=> 2 range to power 2 – 2 = 2 (False)
=> 2 range to power 3 – 2 = 6 > 5 (True)
=> n = 3 (Number of 0s to be changed into 1s =3)
| SUBNET MASK | 255 | 255 | 255 | 0 |
Convert
to binary
3 bits enable
| SUBNET MASK | 11111111 | 11111111 | 11111111 | 11100000 |
| SUBNET MASK | 255 | 224 | 255 | 0 |
=> Magic number = 256 – Mask => 256 -224 = 32
| Subnet 0 | 200 | 10 | 20 | 0/27 |
| Subnet 1 | 200 | 10 | 20 | 32/27 |
| Subnet 2 | 200 | 10 | 20 | 64/27 |
| Subnet 3 | 200 | 10 | 20 | 96/27 |
| Subnet 4 | 200 | 10 | 20 | 128/27 |
| Subnet 5 | 200 | 10 | 20 | 160/27 |
| Subnet 6 | 200 | 10 | 20 | 192/27 |
| Subnet 7 | 200 | 10 | 20 | 224/27 |
You will find Broadcast domain 31; Host 1-30 from subnet 0
Broadcast domain 63; Host 33 - 62 from subnet 1
Broadcast domain 95; Host 65 - 94 from subnet 2
Broadcast domain 127; Host 97 - 126 from subnet 3
Broadcast domain 159; Host129 - 158 from subnet 4
Broadcast domain 191; Host 161 - 190 from subnet 5
Broadcast domain 223; Host 193 - 222 from subnet 6
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