3com 8807 사용자 가이드
10
IP A
DDRESS
C
ONFIGURATION
Introduction to IP
Addresses
Addresses
IP Address Classification
and Representation
An IP address is a 32-bit address allocated to a device that accesses the Internet. It
consists of two fields: net-id field and host-id field. IP addresses are allocated by
Network Information Center (NIC) of American Defense Data Network (DDN). To
manage IP addresses conveniently, IP addresses are classified into five types. See
the following figure.
consists of two fields: net-id field and host-id field. IP addresses are allocated by
Network Information Center (NIC) of American Defense Data Network (DDN). To
manage IP addresses conveniently, IP addresses are classified into five types. See
the following figure.
Figure 14 Five classes of IP addresses
Here, Class A, Class B and Class C addresses are unicast addresses, while Class D
addresses are multicast ones and class E addresses are reserved for special
applications in future. The first three types are commonly used.
addresses are multicast ones and class E addresses are reserved for special
applications in future. The first three types are commonly used.
The IP address is in dotted decimal format. Each IP address contains four integers
in dotted decimal notation. Each integer corresponds to one byte, for example,
10.110.50.101.
in dotted decimal notation. Each integer corresponds to one byte, for example,
10.110.50.101.
When using IP addresses, note that some of them are reserved for special uses,
and are seldom used. The IP addresses you can use are listed in the following
table.
and are seldom used. The IP addresses you can use are listed in the following
table.
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
0
1 0
1 1 0
1 1 1 0
1 1 1 1 0
net-id
net-id
net-id
Multicast address
Reserv ed
host-id
host-id
host-id
Class A
Class B
Class C
Class D
Class E
net-id: network ID host-id: Host ID
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
0
1 0
1 1 0
1 1 1 0
1 1 1 1 0
net-id
net-id
net-id
Multicast address
Reserv ed
host-id
host-id
host-id
Class A
Class B
Class C
Class D
Class E
net-id: network ID host-id: Host ID