CCENT-CCNA:ICND1 100-105 Certification Guide
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The IP addresses and subnets

Nowadays, a lot of effort is being made to advance the development of IP addressing technologies. IPv6 addressing is the best example of such an effort. Nevertheless, even though the IPv6 addressing technology is becoming more and more plausible, it still prefers the role of spectator in the great arena of the internet, where IPv4 addressing technology continues to be the norm.