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Glossary
Public
IP Address
A public IP address is an IP address valid in the Internet.
Every computer or router participating in the Internet must
have a uniquely assigned public IP address. This address
is usually negotiated dynamically with the Internet Service
Provider when a connection to the Internet is dialed. The
Internet Service Provider assigns the negotiated IP ad-
dress to the computer or router for the duration of an Inter-
net session.
Subnetwork
A local IP network can consist of one subnetwork or be di-
vided into multiple subnetworks. The division into subnet-
works is performed when the local IP network is config-
ured. The subnetworks of a local IP network are also IP
networks.
Subnet Mask
The subnet mask indicates which part of an IP address is
the network address and which the address of the com-
puter. The network address defines what is called the sub-
net.
Example 1
IP address:
192.168.178.247
Subnet mask:
255.255.255.0
The assignment of the first three groups of numerals in the sub-
net mask indicates that the first three groups of numerals in the
IP address define the network. The following addresses result:
Network address of the subnet: 192.168.178.0
Address of the computer in the
subnet:
192.168.178.247
IP address pool in the subnet:
192.168.178.0 -
192.168.178.255
The IP addresses
192.168.178.0 and
192.168.178.255 are reser-
ved. This means that the ad-
dresses from 192.168.178.1
to 192.168.178.254 are
available for assignment to the
computers. Therefore a maxi-
mum of 254 computers can be
included in the subnetwork.
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