Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 18)

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101

Configuring IP Services

1-6

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.

Table 1-1 shows the range of possible subnet masks for Class B and Class C

addresses, along with the number of bits that the mask allocates for a subnet

address, the number of recommended subnets associated with the mask, and the

number of hosts per subnet.

Table 1-1. Subnet Masks for Class B and Class C Addresses

Number of Bits Subnet Mask

Number of

Subnets

(Recommended)

Number of Hosts

per Subnet

Class B

2 255.255.192.0 2 16,382

3 255.255.224.0 6 8,190

4 255.255.240.0 14 4,094

5 255.255.248.0 30 2,046

6 255.255.252.0 62 1,022

7 255.255.254.0 126 510

8 255.255.255.0 254 254

9 255.255.255.128 510 126

(continued)

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 465 466

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