The network and mask combination that requires the use of a
classless addressing solution is 172.16.0.0/12. Classless routing
is supernetting and is known as CIDR, Classless Inter-Domain
Routing.
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Classless Inter-Domain Routing (CIDR) is a method for allocating
IP addresses and routing Internet Protocol packets, Or (CIDR) The
Center for Inherited Disease Research, that was founded in
1997.
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Routing algorithms that are restricted to only work within the
domain are referred as intera-domain routing algorithms and if they
are not restricted only within the domains then they are
inter-domain algorithms.
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A classless routing protocol can route between subnets