Table of Contents
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162
A
F: I
IP A
PPENDIX
NTRODUCTION TO
DDRESSING
address is Class A, use a subnet mask of
. Class
255.0.0.0
B addresses use a subnet mask of
, and Class
255.255.0.0
C IP addresses use a subnet mask of
.
255.255.255.0
Default Gateway
A default gateway is like a long distance operator — users
can dial the operator to get assistance connecting to the
end party. In complex networks with many subnetworks,
gateways keep traffic from traveling between different
subnetworks unless addressed to travel there. While this
helps to keep overall network traffic more manageable, it
also introduces another level of complexity.
To communicate with a device on another network, the
message must go through a gateway that connects the
two networks. Therefore, users need to know the default
gateway's IP address. If there is no gateway in the network,
use an IP address of
in fields that apply to a
0.0.0.0
default gateway.
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