Thursday, 14 February 2019

Calculate Subnet Mask

You can calculate subnet mask and even break down IP address classes to help route the traffic in a network.

Calculating Subnet Mask


Those who are ready to take the CCNA exam, they need to calculate a subnet mask. Before you calculate the subnet mask, you should write down public and private class address ranges, as follows:

IP Address Class


Class A: 1 – 126 (127 reserved)
Class B: 128 – 191
Class C: 192 – 223
Class D: 224 – 239 (reserved)
Class E: 240 -254 (reserved and experimental)

Private Addresses


Class A: 10.0.0.0 through 10.255.255.255
Class B: 172.16.0.0 through 172.31.255.255
Class C: 192.168.0.0 through 192.168.255.255

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