Subnet masks restrict network communication.
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Example: PC1 can talk to PC2
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PC1
IP Address: 192.168.1.2
Subnet Mask: 255.255.255.0
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PC2
IP Address: 192.168.1.3
Subnet Mask: 255.255.255.0
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Note
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0 denotes that there is no limit to communication at this part of the address.
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In the above example, we can communicate with anything that has an IP address that begins with 192.168.1.X.
