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hello,it is also called as classless inter domain routing (cidr) . supernetting is used to combining two or more networks .suppose cisco has 500 devices .if we use class B but it will waste more ip address .
192.168.0.0 ----- 192.168.1.255
192.168.2.0 ----- 192.168.3.255
192.168.4.0
255.255.11111111 . 00000000
2power h-2 greater than equal required no of host
2power9 gt eql 500
510 gt eql 500
Supernatting is opposite of subnetting , because we want to reduce advertisement less number of route in the internet , because if we will advertise all route toward the internet its very difficult for networking device to manage the big size of routing table .
A supernet is created by combining several Internet Protocol (IP) networks or subnets into one network with a single classless interdomain routing (CIDR) prefix. The new combined network has the same routing prefix as the collection of the prefixes of the subnets. The procedure used to create a supernet is commonly called supernetting, route aggregation or route summarization.Supernetting enables organizations to modify their network size and minimize the extensive requirement of network routing devices by combining several independent routes. It also helps to conserve address space and helps the router to effectively store routing information and minimize processing overheads while matching the routes. Supernetting supports the CIDR address coding scheme, allowing routing table entries to be reduced.
I fully agree with the answers been added by EXPERTS..............Thanks.
