ZyXEL Communications G-3000 Guia do Utilizador descarregar pdf (Página 177)

ZyAIR G-1000 Access Point User’s Guide

IP Subnetting G-5

to an actual host for the first subnet is 192.168.1.1 and the highest is 192.168.1.126. Similarly the host ID

range for the second subnet is 192.168.1.129 to 192.168.1.254.

Example: Four Subnets

The above example illustrated using a 25-bit subnet mask to divide a class “C” address space into two

subnets. Similarly to divide a class “C” address into four subnets, you need to “borrow” two host ID bits to

give four possible combinations of 00, 01, 10 and 11. The subnet mask is 26 bits

(11111111.11111111.11111111.11000000) or 255.255.255.192. Each subnet contains 6 host ID bits, giving

-2 or 62 hosts for each subnet (all 0’s is the subnet itself, all 1’s is the broadcast address on the subnet).

Chart 12 Subnet 1

NETWORK NUMBER LAST OCTET BIT VALUE

IP Address 192.168.1. 0

IP Address (Binary) 11000000.10101000.00000001.

00000000

Subnet Mask (Binary) 11111111.11111111.11111111.

11000000

Subnet Address: 192.168.1.0 Lowest Host ID: 192.168.1.1

Broadcast Address: 192.168.1.63 Highest Host ID: 192.168.1.62

Chart 13 Subnet 2

NETWORK NUMBER LAST OCTET BIT VALUE

IP Address 192.168.1. 64

IP Address (Binary) 11000000.10101000.00000001.

01000000

Subnet Mask (Binary) 11111111.11111111.11111111.

11000000

Subnet Address: 192.168.1.64 Lowest Host ID: 192.168.1.65

Broadcast Address: 192.168.1.127 Highest Host ID: 192.168.1.126

Chart 14 Subnet 3

NETWORK NUMBER LAST OCTET BIT VALUE

IP Address 192.168.1. 128

IP Address (Binary) 11000000.10101000.00000001.

10000000

1 2 ... 172 173 174 175 176 177 178 179 180 181 182 ... 196 197

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