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Comptia N+ exams & networking computers

#3
have you tried the resources on the net?

Cisco do a reasonable explanation, or try this one
IP subnetting made easy | TechRepublic

In basis subnetting is the art of extending the available range of IP addresses available, without subnetting we would have run out of IP addresses in about 1995.

You decide what size of network you wish to run under an IP address (and what type) and split the address accordingly by using a subnet mask.
 

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