Classless Inter-Domain Routing (CIDR)ĬIDR (as per RFC1519) was implemented to allow the routing of both classful and classless networks. Both of which are key to modern day subnetting. The solution to this issue came in the form of - Classless Inter-Domain Routing (CIDR) and Variable Length Subnet Masking (VLSM). With the explosion of the internet and the need to address more and more devices, this issue was compounded and a solution was required. However, this was hugely inefficient, should a company require 2 IP addresses for a point to point link then the smallest classful network that could be assigned was a class C network, which would provide 256 hosts. Each class provided a different subnet mask based upon the IP range. This architecture provided three different network classes - known as class A, B and C. When the IP protocol was first released it was built upon a classful addressing architecture. For example, 255.255.0.0 would result in the first 2 octets (16bits) being the network bits and the remainder being the host bits. Within a subnet mask, the sequential bits that are on (1) are deemed the network bits and the bits that off (0) are considered the host bits. To determine which parts of an IP address are the network bits, and which are host bits, a subnet mask is used.
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