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CIDR is based on variable-length subnet masking (VLSM), in which network prefixes have variable length (as opposed to the fixed-length prefixing of the previous classful network design). The main benefit of this is that it grants finer control of the sizes of subnets allocated to organizations, hence slowing the exhaustion of IPv4 addresses ...
Berlekamp–Massey algorithm. The Berlekamp–Massey algorithm is an algorithm that will find the shortest linear-feedback shift register (LFSR) for a given binary output sequence.
In order to address the issues of address space and other factors, Cisco created EIGRP (Enhanced Interior Gateway Routing Protocol). EIGRP adds support for VLSM (variable length subnet mask) and adds the Diffusing Update Algorithm (DUAL) in order to improve routing and provide a loopless environment.
As in IPv4, subnetting in IPv6 is based on the concepts of variable-length subnet masking (VLSM) and the Classless Inter-Domain Routing methodology. It is used to route traffic between the global allocation spaces and within customer networks between subnets and the Internet at large.
Retrieved from "https://en.wikipedia.org/w/index.php?title=VLSM_and_why_is_it_used%3F&oldid=81631965"
From an avoided double redirect: This is a redirect from an alternative title or related topic of Variable-length subnet mask, another redirect to the same title.Because double redirects are disallowed, both pages currently point to Classless Inter-Domain Routing#VLSM.
English: VLSM chart, shows the different possible subnets with masks larger than /24. Helps to find the network, netmask and host addresses. Helps to find the network, netmask and host addresses. Español: Tabla VLSM, muestra las diferentes subredes posibles con máscaras mayores a /24.
The periodic routing updates do not carry subnet information, lacking support for variable length subnet masks (VLSM). This limitation makes it impossible to have different-sized subnets inside of the same network class. In other words, all subnets in a network class must have the same size.