RADVision VIU-323, Руководство пользователя

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C-1
IP Addressing Scheme
The VIU-323 operates on an IP-based LAN. IP addresses are the addressing mechanism of
the TCP/IP protocol. The IP address is composed of a 32-bit packet represented by four
numbers between 0-255 separated by dots, for example: 192.36.20.198. This numbering
scheme is known as the dotted-decimal notation. The numbers specify the class, network
and host (or node) parts of the IP address.
IP addresses are divided into four different classes, which differ according to the number of
bits allocated to the network (prefix) and host (suffix) parts of the address. The more bits
allocated to the network part, the fewer remain for the host part. The prefix defines unique
network addresses; the suffix identifies the hosts on these networks.
The following figure illustrates the four address classes, the bits used to identify each class
and the division of the address into prefix and suffix.
0
prefix suffix
1 0
prefix suffix
1 1 0
prefix
1 1 1 0
suffix
multicast address
0 8 16 24 31
Class A
Class B
Class C
Class D
Figure 21 - IP address classes, their identifying bits and the prefix/suffix division