CCNA study question. is enabling the device to allow user- or group-based access Authentication or Authorization?thanks

Here is a question. Different people are giving different answers. Can someone please chime in?Thanks  

Which IPv6 address range is suitable for anycast addresses for distributed services such as DHCP or DNS?2001:db8:0234:ca3e::1/1282002:db84:3f30:ca84:be76:2/64The first one isn't a range. but people are saying that the second one is invalid. But why? 

Packets received by the router from BGP enter via a serial interface at 209.165.201.10. Each route is present within the routing table. Which interface is used to forward traffic with a destination IP of 10.10 10 24?People are saying that the answer ...

Please see attached pic. In this question, the destination address 10.0.1.15 matches the route in the routing table. But it's the broadcast address within that range. Would the packet still be routed with that route?what would the next hop be? 192.16...