As with IPv4, it is important that devices are configured with the appropriate IPv6 address based on where they reside so that packets can be successfully routed to and from them. Refer to Figure 10-1, which depicts an IPv6 network. 2001:db8:A:A::/64 represents the first 64 bits of the IPv6 address, which is the subnet prefix. This is the IPv6 network the nodes reside in. Router R1 has an interface IPv6 address of 2001:db8:a:a::1 where the last 64 bits, which are ::1 in this case, represent the interface/host ID or who it is in the IPv6 network. PC1 is ::10 and PC2 is ::20. All the devices in 2001:db8:a:a::/64 are configured with a default gateway address of R1’s Gig0/0 interface, which is 2001:db8:a:a::1.