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Cisco Self-Study: Implementing IPv6 Networks (IPV6) by Régis Desmeules

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Rationale for IPv6

You should understand that IPv6 was designed and engineered for many reasons. First and foremost, the Internet Protocol version 4 (IPv4) address scheme is limited by its 32 bits, which causes problems for the long-term growth of the Internet. Moreover, parts of the IPv4 address scheme, such as Class D and E, are reserved for special uses. This also decreases the number of globally unique unicast IPv4 addresses available. Then, very large blocks of globally unique unicast addresses were assigned to organizations in the 1980s, even though the Internet has been growing quickly, especially in Asia and Europe. But, some countries in Asia and Africa received just one Class C address for the entire country because they arrived late ...

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