Date Added: Jan 2012
In IpV4 major requirement is that all the IP networks should have unique network number, even if they are or if they are not connected with the internet, which results in the consumption of more addresses, due to this consumption IP addresses in IPV4, are becoming exhausted. Secondly the structure of IPV4 is of classes which had address spaces with different size and studied independently. To manage this problem internet experts focus on the use of Classless Inter Domain Routing (CIDR) and Dynamic Host Configuration protocol (DHCP) to manage the address space. But due to the growth in usage of internet CIDR and DHCP are not working properly as an alternative.