NETGEAR RH340 - ISDN INET Gateway Router, Справочное руководство

Страница: 64 / 85

Reference Guide for the Model RH340 Internet Access ISDN Router
Basic Routing Information 7-3
Figure 7-1. Three Main Address Classes
Class A addresses can have up to 16,777,214 hosts on a single network. They use an 8-bit network
number and a 24-bit node number. Class A addresses are in this range:
1.x.x.x to 126.x.x.x.
Class B addresses can have up to 65,354 hosts on a network. A Class B address uses a 16-bit
network number and a 16-bit node number. Class B addresses are in this range:
128.1.x.x to 191.254.x.x.
Class C addresses can have 254 hosts on a network. Class C addresses use 24 bits for the network
address and 8 bits for the node. They are in this range:
192.0.1.x to 223.255.254.x.
Class D addresses are used for multicasts (messages sent to many hosts). Class D addresses are in
this range:
224.0.0.0 to 239.255.255.255.
Class E addresses are for experimental use.
This addressing structure allows IP to uniquely identify each physical network and each node on
each physical network.
7261
Class A
Network Node
Class B
Class C
Network Node
Network Node