Global Unicast Addresses Routable and reachable across the Internet Identified by their three high-level bits set to001(2000:/3) Network ID ISP Site LAN Host 3 29 Bits 16Bits、16Bits 64 Bits Global Prefix SLA LAN Interface ID 001 1/32 /48 /64Global Unicast Addresses ◼ Routable and reachable across the Internet ◼ Identified by their three high-level bits set to 001 (2000::/3)