Xpeed 320R, Руководство пользователя

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IP Networking Basics IP Addressing
70 Xpeed Networks, Inc.
In addition, routing improves network security by isolating traffic to the LAN.
The X320R will prevent information intended for recipients in your local network
from going out externally.
2. IP A
DDRESSING
Every PC has a unique IP address assigned to it to ensure that data reaches the cor-
rect destination. The IP address is a 32-bit structure, typically written in a dot
notation with 8-bit groups. For example the IP address:
192.168.1.15
represents a 32-bit structure:
11000000 10101000 00000001 00001111
An IP Address consists of two parts: a network identifier and a host identifier. The
dividing point may vary, depending on the addressing class being used. There are
five standard addressing classes:
• Class A - uses an 8-bit network address and a 24-bit host address. This
allows up to 16,777,214 hosts on each network.
• Class B - uses a 16-bit network address and a 16-bit host address. This
allows up to 65,354 hosts on each network.
• Class C - uses a 24-bit network address and an 8-bit host address. This
allows up to 254 hosts on each network.
• Class D - is used for multicast
• Class E - is for experimental use.
For each network address range, there are two addresses that are reserved:
• Host Address is all 0s - Network address used to identify the network,
not assigned to any host
• Host Address is all 1s - Broadcast address to send a packet simulta-
neously to all hosts with the same network address.