As a network designer, after determining the number of necessary IP addresses, the next big decision is to find out whether private, public, or a combination of private and public addresses will be used. Private internetwork addresses are defined in RFC 1918 and are used internally within the network. From a real-world standpoint, because of the limitation of the number of public IP addresses, NAT techniques are usually used to translate the private internal numbers to external public addresses. Internally, one of the following three ranges of addresses can be used:
- 10.0.0.0/8 (10 . . .
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