IP address sub-netting
Aim: To study IP address sub-netting.
THEORY:
A subnet is a segment of a
network. Sub netting is a technique that allows a network administrator to
divide one physical network into smaller logical networks and, thus, control
the flow of traffic for security or efficiency reasons.
Dividing a network into several
subnets can serve a number of purposes: to reduce network traffic by decreasing
the number of broadcasts (if used in combination with a switch), to exceed the
limitations in a local area network, for instance the maximum number of allowed
hosts, or to enable employees to be able to dial in to the network from home,
without opening the entire network up to unwanted visits from the Internet.
Subnets are created by using a
so-called subnet mask to divide a single Class A, B, or C network number into
smaller pieces, thus allowing an organization to add subnets without having to
obtain a new network number through an Internet service provider. Subnets can
again be sub netted into sub-subnets. Subnets were originally invented to help
solve the lack of IP addresses on the Internet. The benefits of sub netting
are:
1. Reduced
network traffic
2. Simplified
management
3. Smaller
broadcast domain
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