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CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

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Why Do We Need IPv6?

Well, the short answer is because we need to communicate and our current system isn’t really cutting it anymore—kind of like how the Pony Express can’t compete with airmail. Just look at how much time and effort we’ve invested in coming up with slick new ways to conserve bandwidth and IP addresses. We’ve even come up with Variable Length Subnet Masks (VLSMs) in our struggle to overcome the worsening address drought.

It’s reality—the number of people and devices that connect to networks increases each and every day. That’s not a bad thing at all—we’re finding new and exciting ways to communicate to more people all the time, and that’s a good thing. In fact, it’s a basic human need. But the forecast isn’t exactly blue skies ...

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