Sub Netting and Super Netting Differences:
Why there is need to scale the network. There are two issues for that. Proper utilization of addresses used and proper scaling of the routing. These are major problem. They cannot be solved simply by installing router memory and increasing the size of routing tables.
It is a 32 bit binary number represented in 4 decimal values each represent 8 bits range from 0 to 255. It holds the address of network id and host id. It is also called internet protocol address.
Class A begins with 0xxx. It has value in range 1 to 126. Class B begins 10xx. It has range from 128 to 191. Class C begins with 110x. It has range from 192 to 239. Class D begins with 1110. It has range from 224 to 239. Class E begins from 1111. It has range from 240 to 254. In which CLASS A, B and C are most widely used. Class d is used for addresses and class e is used for future reference.
Sub Netting and Super Netting in TCS IP:
Subnet: IP contains two parts, network ID and host ID. They are represented in class A, B and C. For sub netting host ID is divided into two parts. Subnet ID and host ID.
CIDR: classless inter-domain routing. It is an important feature as it eliminated the concept of class and it also supports route aggregation. It allocates address space efficiently. It is notate like xxx.xxx.xxx.xxx/n, where n is number of leftmost bit. For example: 192.168.12.2/23 represents the two c class networks like 192.168.12.0 and 192.168.13.0. 1o/8 denotes address from 10.0.0.0 to 10.255.255.255.
Assuming portion of ISP address block:
– A aggregates 8/24 into single: (200.25.16.0/21);
– B aggregates 4/24 into single: (200.25.24.0/22);
– C aggregates 2/24 into single: (200.25.28.0/23);
– D aggregates 2/24 into single: (200.25.30.0/23);
ISP will use 256/24 in its allocation for internet with advertisement like 200.250.0.0/16.
Download Technical Seminar Topic on Sub Netting and Super Netting PPT .