When you're studying to transfer the CCNA, you're introduced to private addresses, the come ranges formally referred to as RFC 1918 Private Addresses. (RFC stands for Request For Comment; to wager a exemplary RFC, meet place that constituent in your selection wager engine.)
There are threesome ranges of 1918 Private Addresses, digit in apiece field meshwork class.
Class A: 10.0.0.0 /8
Class B: 172.16.0.0 /12
Class C: 192.168.0.0 /16
Be certain - these masks are not the classful meshwork masks you're old with!
The requirement for clannish come ranges arose when we started streaming discover of IP addresses! (A aggregation of us never intellection that would happen, but a aggregation of us utilised to conceive wed never requirement hardware units large than disc disks, too.) You crapper envisage that as networks began to be installed in offices and schools worldwide, the exhaustible sort of IP addresses became a constraining factor.
Many devices that were using these wanted IP addresses did not requirement to transmit with some figure right its possess topical Atlantic meshwork (LAN). Therefore, these devices could be appointed an IP come that could be utilised on added figure in added LAN - but these devices would not be healthy to transmit crossways the Internet.
It was definite to create meshwork come ranges that would be utilised only for much devices. That's ground when you go from digit topical Atlantic meshwork to another, you'll commonly wager hosts with IP addresses from the above threesome ranges.
Of course, as instance went on, more and more of these devices did requirement to accomplish hosts crossways the Internet. That's where NAT - Network Address Translation - comes into play. But that is a person for added tutorial!
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