Shulou(Shulou.com)06/03 Report--

Several common types of public network ip addresses:

Class An ip address range is: 0.0.0.0-127.255.255.255 can have 16777214-2 hosts, suitable for large networks

Class B ip address range: 128.0.0.0-191.255.255.255 can have 65534-2 hosts, suitable for medium-sized networks

Class C ip address range is: 192.0.0.0-223.255.255.255 can have 254-2 hosts, suitable for small networks

Several common types of private ip addresses

Class An IP address range is: 10.0.0.0-10.255.255.255

Class B ip address range is: 172.16.0.0-172.31.255.255

Class C ip address range is: 192.168.0.0-192.168.255.255

Subnet mask

1. The so-called 24-bit subnet mask refers to the number of 1 and bit subnet masks after the subnet mask is converted into binary.

For example: 192.168.1.100 Compact 24

After the subnet mask is converted to this form, xxxxxxxxx.xxxxxxxx.xxxxxxxxx.xxxxxxxx has 24 1s and the rest are all zeros.

That is, 11111111.111111111111111111.00000000, and then simplified to 255.255.255.0.

two。 Network number, host number

As above: 255.255.255.0 after the conversion to binary, there are as many as 1, the network number is as many as 0, and the host number is as many as.

For example:

255.255.255.224011111111.11111111.11111111.11100000

Host number is 5, network number is 27

3. Calculate the number of hosts that can be accommodated by subnet mask

For example: 225.255.244.0 = > 1111111.11111111.11111000.00000000

Therefore, the number of hosts owned by the subnet mask is: 2 ^ 11-2 million 2046 (see how many zeros are behind)

If there are m zeros, the number of hosts that can be owned is: 2 ^ m-2

Network address

For example: ip is 192.168.1.100

192.168.1.100 11000000.10100.00000001.01100100

255.255.255.09111111111111111111111111.00000000

After performing the logical and operation on the right side of the two expressions: 11000000.10101000.00000001.000000192.168.1.0

So the identifier of the network segment is 192.168.1.0

Broadcast address:

Calculate the broadcast address: calculate the broadcast address using the network address:

For example, ip is 192.168.1.101 and subnet mask is 255.255.255.0

11000000.10101000.00000001.01100101

11111111.111111111111111111.00000000 thus the host number is 8 and the network number is 24

After and operation:

11000000.10101000.00000001.00000000

Then change the 8 host numbers after the operation to 1, and get

11000000.10101000.00000001.11111111

That is, the broadcast address is 192.168.1.255

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