Classless Inter-Domain Routing CIDR
For Complete YouTube Video: Click Here
This class will try to understand Classless Inter-Domain Routing CIDR.
We have already discussed the concepts of classful addressing in our previous classes.
Classless Inter-Domain Routing CIDR
The concept of Classless Inter-Domain Routing CIDR is essential to understand for end semester exams and GATE CSE.
We have divided the entire IP address into five classes in classful addressing.
- Class A
- Class B
- Class C
- Class D
- Class E
One of the most important disadvantages of classful addressing is the inefficient utilization of IP addresses.
For example, we want to create a network with 300 systems with classful addressing, and we have to opt for a class B address.
The class B address can be 65535 IP addresses in a network, but we need only 300.
The remaining all are wasted.
The addressing mechanism that is widely used is classless addressing or Classless Inter-Domain Routing CIDR.
In this addressing mechanism, all the IP addresses are under the control of IANA: Internet Assigned Numbers Authority.
Whoever wants the IP addresses they have to get them from IANA.
One important rule that we have to follow is asking for powers of IP addresses.
For example, if we need 300 IP addresses, we must ask for 512 IP addresses, which is 2^9.
When compared with classful addressing, we have less wastage of IP addresses.
Click on the complete YouTube video provided above for more clarity on Classless Inter-Domain Routing CIDR.