Transcript Hour 5

Hour 5
Subnetting
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you will be able to
Explain how subnets and supernets are
used
 Explain the benefits of subnetting
 Develop a subnet mask that meets
business needs
 Describe supernetting and CIDR
notation

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Subnets in TCP/IP
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To borrow some of the bits from the
host ID to designate a subnet address.
 Subnet uses a 1 in the part of the
network ID or subnet ID.
 And uses a 0 in the IP address that is
part of the host ID.

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Converting a Subnet Mask to
Dotted Decimal Notation
11111111111111111111111100000000
255.255.255.0
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Working with Subnets
The subnet mask defined how many
bits will be used for the subnet ID .
 The best solution is to plan your
network first and determine the number
and location of all network segments,
then assign each segment a subnet ID.
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
Figure 5.6, the network 129.100.0.0 is
divided into four subnets
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
Figure 5.7. A subnetted Class C
network.
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Classless Internet Domain
Routing

Classless Internet Domain Routing (CIDR) is
a technique that allows a block of network IDs
to be treated as a single entity in routing
tables.
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called a supernet mask.

the supernet mask in effect takes bits away
from the network ID
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