A company is designing a worldwide IPv6 network with duplicated file servers at multiple locations. Each file server contains identical reference information. Which IPv6 address type would be used to allow each end station to send a request to the nearest file server using the same destination address, regardless of the location of that end station?

A.
broadcast

B.
multicast

C.
anycast

D.
unicast

Explanation:

IPv6 Anycast Addresses
The IPv6 anycast (one-to-nearest) address identifies a set of devices. An anycast address is allocated from a set of unicast addresses. These destination devices should share common characteristics and are explicitly configured for anycast.

You can use the anycast address to identify a set of routers or servers within an area. When a packet is sent to the anycast address, it is delivered to the nearest device as determined by the routing protocol. An example of the use of anycast addresses is to assign an anycast address to a set of servers–one in North America, and the other in Europe. Users in North America would be routed to the North American server, and those in Europe to the European server.

You cannot use an anycast address as a source address. Also, you must explicitly configure nodes to which the anycast address is assign to recognize the anycast address.

Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 9