Analysis of the example of network subnet division in secondary vocational school

One 、 Determination of subnet mask

          Give several subnets directly according to the topic （ direct method ）. Give the number of hosts , You need to calculate the number of hosts , Finally, subtract the required number of hosts from the number of hosts in the default subnet mask , Get the number of subnets （ indirect method ）

        1. Determine the proportion IP Several host bits in the are used as subnet identifiers

A. Convert numbers into binary numbers and see how many digits .B.2n-1<X<2n        N That is, the number of subnet identifiers .

       2. In accordance with the IP type , Write the default subnet mask binary .

       3. Above the default binary subnet mask , Change the host identification number to 1. And convert to decimal

Two 、 The division of subnets

According to the given IP Address 218.98.101.0, The default subnet mask is 255.255.255.0, So you can be sure , The network address is 218.98.101, The host address is 0

Dividing subnets focuses on the host address , Convert to binary to 00000000

1. Subnet identification accounts for 3 position

Requirement Division 6 Subnet , Then the subnet ID is 3 position , The specific division is as follows ：

2、 If the subnet ID accounts for 2 position

3、 If the subnet ID accounts for 4 position