ZyXEL Communications P-660 series Guia do Utilizador descarregar pdf (Página 243)

P-660R-F1 Series User’s Guide

243

Host IDs of all zeros represent the subnet itself and host IDs of all ones are the broadcast address for that

subnet, so the actual number of hosts available on each subnet in the example above is 2

– 2 or 126 hosts for

each subnet.

192.168.1.0 with mask 255.255.255.128 is the subnet itself, and 192.168.1.127 with mask 255.255.255.128 is

the directed broadcast address for the first subnet. Therefore, the lowest IP address that can be assigned 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 (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 zeroes is the subnet itself, all ones is the broadcast address on the

subnet).

Table 107 Subnet 1

IP/SUBNET MASK 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

Table 108 Subnet 2

IP/SUBNET MASK 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

Table 109 Subnet 3

IP/SUBNET MASK NETWORK NUMBER

LAST OCTET BIT

VALUE

IP Address 192.168.1. 128

IP Address (Binary) 11000000.10101000.00000001. 10000000

Subnet Mask (Binary) 11111111.11111111.11111111. 11000000

Subnet Address:

192.168.1.128

Lowest Host ID: 192.168.1.129

Broadcast Address:

192.168.1.191

Highest Host ID: 192.168.1.190

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