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What is Classless Inter-Domain Routing
CIDR, also referred to as supernetting, assigns IP addresses to more efficiently distribute addresses.
This replaced the previous system based on Class A, B, and C networks. When you have a group of IP addresses, it’s called a block. CIDR blocks share the same prefix and contain the same number of bits. Supernetting is the combination of multiple connecting CIDR blocks into a larger whole, sharing a common network prefix. CIDR Block Characteristics IP addresses in blocks are continuous First address of a block is divisible by the number of addresses of a block Size of the block should be a power of 2 Parts of CIDR IP addresses Benefits of CIDR Reduces entries in the routing table Reduce wasted IP address space |
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