Avaya Configuring IP Services Manual do Utilizador Página 31

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IP Concepts, Terminology, and Features
117356-A Rev. A 1-5
You construct a subnet mask as follows:
Assign a value of 1 to each of the 8, 16, or 24 bits in the network field.
Assign a value of 1 to each bit in the subnet field.
Assign a value of 0 to each bit in the host field.
Convert the resulting 32-bit string to dotted-decimal notation.
For example, to construct a subnet mask for the IP address described earlier
(10000000 00100000 00001010 10100111), do the following:
1. Assign a value of 1 to each bit in the network field.
The position of the first bit set to 0 in the first octet of the IP address indicates
that the network is Class B; therefore, the network field contains 16 bits:
11111111 11111111.
2. Assign a value of 1 to each bit in the subnet field.
The network administrator allocated the upper 8 bits of the local portion to the
subnet portion, as follows: 11111111.
3. Assign a value of 0 to each bit in the host field.
The network administrator allocated the lower 8 bits of the local portion field
to the host identification, as follows: 00000000.
4. Convert the resulting 32-bit string (11111111 11111111 11111111 00000000)
to dotted-decimal notation, as follows: 255.255.255.000.
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