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ccna 200 301 bookshelf vitalsource audible books.5.3.4 IPv6 Address TypesWe're already familiar with IPv4 unicast, broadcast, and multicast, and the way these addresses are forwarded basically defines which device you're communicating with, or at least how many devices you're communicating with. But as I mentioned before, IPv6 has modified these three types of addresses by adding anycast and removing broadcast, because broadcast is very inefficient.Let's take a look at these IPv6 addressing types and communication methods.Unicast Packets sent to a unicast address are sent to a separate interface. There are also several different types of unicast addresses, but we won't go into depth on that.Global unicast addresses These are usually publicly routable addresses, the same as public routable addresses in IPv4.5.3 IPv6 Addressing 149Global unicast addresses are those that begin with 2000::/3.Link-local addresses These addresses are similar to private addresses in IPv4, which cannot be routed globally, and begin with FE80::/10. These addresses are very useful tools that you can use to form temporary LANs to organize meetings, or you can build a small LAN to share and access files and services locally on it, without global routing.Unique Local Addresses (RFC4193) These addresses are also not used for routing over the Internet±, but they are also essentially globally unique, so you do not encounter duplicate addresses. Unique local addresses are used in place of "site-local addresses", so they serve essentially the same purpose as IPv4 private addresses - enabling intra-site communication and routing between multiple local networks. Site Local Addresses were deprecated in September 2004. ULAs (Unique Local Addresses) contain a 40-bit random character prefix beginning with FC00::/7, which cannot be routed across the Internet.Multicast This is the same type of address as IPv4, and packets destined for a multicast address are sent to all interfaces that have joined the multicast address. Some people call them "one-to-many" addresses. Multicast addresses in IPv6 are very recognizable because they all start with FF.