Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur télécharger pdf (Page 27)

100

101

IP Concepts, Terminology, and Features

308627-14.20 Rev 00

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 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.

Allocate the upper 8 bits of the local portion field to the subnet portion, as

follows: 11111111.

3. Assign a value of 0 to each bit in the host field.

Allocate 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: 255.255.255.0.

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 389 390

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Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur Page 27

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