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Answer Posted / sandeep pawar
Classless Inter-Domain Routing (CIDR) is a method of
allocating IP addresses and routing Internet Protocol
packets.
It facilitates routing by allowing blocks of addresses to
be grouped into single routing table entries. These groups,
commonly called CIDR blocks, share an initial sequence of
bits in the binary representation of their IP addresses.
When emphasizing only the size of a network, terms like /20
are used, which is a CIDR block with an unspecified 20-bit
prefix.
A Variable Length Subnet Mask (VLSM) is a means of
allocating IP addressing resources to subnets according to
their individual need rather than some general network-wide
rule. Of the IP routing protocols supported by Cisco,
OSPF, Dual IS-IS, BGP-4, and EIGRP support "classless" or
VLSM routes.
Classless Inter-Domain Routing is based on variable-length
subnet masking (VLSM), which allows a network to be divided
into different-sized subnets. CIDR avoids wasting IP
addresses
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