Netgear PS113 PS113 Reference Manual - Page 155

Subnet Addressing, B-2., Example of Subnetting a Class B Address

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Installation and Reference for the Model PS104/PS105/PS110/PS113 Print Server Subnet Addressing By looking at the addressing structures, you can see that even with a Class C address there are a large number of hosts per network. Such a structure is an inefficient use of addresses if each end of a routed link requires a different network number. It is unlikely that the smaller office LANs would have that many devices. You can resolve this problem by using a technique known as subnet addressing. Subnet addressing allows us to split one IP network address into smaller multiple physical networks known as subnetworks. Some of the node numbers are used as a subnet number instead. A Class B address gives us 16 bits of node numbers translating to 64,000 nodes. Most organizations do not use 64,000 nodes, so there are free bits that can be reassigned. Subnet addressing makes use of those bits that are free, as illustrated in Figure B-2. Class B Network Subnet Node 7262 Figure B-2. Example of Subnetting a Class B Address A Class B address can be effectively translated into multiple Class C addresses. For example, the IP address of 172.16.0.0 is assigned, but node addresses are limited to 255 maximum, allowing 8 extra bits to use as a subnet address. The IP address of 172.16.97.235 would be interpreted as IP network address 172.16, subnet number 97, and node number 235. In addition to extending the number of addresses available, subnet addressing provides other benefits. Subnet addressing allows a network manager to construct an address scheme for the network by using different subnets for other geographical locations in the network or for other departments in the organization. B-4 Understanding IP Addresses

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Installation and Reference for the Model PS104/PS105/PS110/PS113 Print Server
B-4
Understanding IP Addresses
Subnet Addressing
By looking at the addressing structures, you can see that even with a Class C address there are a
large number of hosts per network. Such a structure is an inef
fi
cient use of addresses if each end of
a routed link requires a different network number. It is unlikely that the smaller of
fi
ce LANs would
have that many devices. You can resolve this problem by using a technique known as subnet
addressing.
Subnet addressing allows us to split one IP network address into smaller multiple physical
networks known as subnetworks. Some of the node numbers are used as a subnet number instead.
A Class B address gives us 16 bits of node numbers translating to 64,000 nodes. Most
organizations do not use 64,000 nodes, so there are free bits that can be reassigned. Subnet
addressing makes use of those bits that are free, as illustrated in
Figure
B-2
.
Figure B-2.
Example of Subnetting a Class B Address
A Class B address can be effectively translated into multiple Class C addresses. For example, the
IP address of 172.16.0.0 is assigned, but node addresses are limited to 255 maximum, allowing
8 extra bits to use as a subnet address. The IP address of 172.16.97.235 would be interpreted as
IP network address 172.16, subnet number 97, and node number 235. In addition to extending
the number of addresses available, subnet addressing provides other bene
fi
ts. Subnet addressing
allows a network manager to construct an address scheme for the network by using different
subnets for other geographical locations in the network or for other departments in the
organization.
7262
Class B
Network
Subnet
Node