HP jetdirect 250m, Руководство пользователя

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Subnets
When an IP network address for a particular network class is
assigned to an organization, no provision is made for more
than one network being present at that location. Local network
administrators use subnets to partition a network into several
different subnetworks. Splitting a network into subnets can
result in better performance and improved use of limited
network address space.
Subnet Mask
The subnet mask is a mechanism used to divide a single IP
network into several different subnetworks. For a given
network class, a portion of an IP address that would normally
be used to identify a node is used, instead, to identify a
subnetwork. A subnet mask is applied to each IP address to
specify the portion used for subnetworks, and the portion used
to identify the node. For example, see
Example: Subnet Mask
255.255.0.0 Applied to Class A Network .
Table A.3 Example: Subnet Mask 255.255.0.0
Applied to Class A Network
Class A Network
Address
15 xxx xxx xxx
Subnet Mask 255 255 0 0
IP Address fields
with Subnet
Mask applied
Network Subnet Host Host
Example of a
node's IP
Address on
Subnet 1
15 1 25 7
Example of a
node's IP
Address on
Subnet 254
15 254 64 2