Classless Inter Domain Routing (CIDR)
CIDR (Classless Inter-Domain Routing or supernetting)
is a method of assigning
IP addresses that improves the efficiency of address distribution.
In CIDR there is no wastage of IP addresses as
compared to classful addressing because only the numbers of IP addresses that
are demanded by the customer are allocated to the customer.
The suffix, which means how many bits are in the whole
address (e.g. /12), is the second component. A CIDR IP address will look
anything like this when put together –
192.100.65.10/15
As part of the IP address, the network prefix is also
defined. These changes are based on how many bits are needed. As an
illustration, in the above example, the first 15 bits of the address are for
the network, while the last 15 bits are for host addresses.
The advantage of using CIDR notation
is that it reduces the number of entries in the routing table and also it
manages the ip address space.
The disadvantage of using CIDR
notation is that it increases the complexity of the network address, which is
one of the benefits of classful addressing.
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