What is the difference between IPv6 unicast and anycast addressing?
A.
An individual IPv6 unicast address is supported on a single interface on one node, but an IPv6 anycast address is assigned to a group of interfaces on multiple nodes.
B.
IPv6 anycast nodes must be explicitly configured to recognize the anycast address, but IPv6 unicast nodes require no special configuration.
C.
IPv6 unicast nodes must be explicitly configured to recognize the unicast address, but IPv6 anycast nodes require no special configuration.
D.
Unlike an IPv6 anycast address, an IPv6 unicast address is assigned to a group of interfaces on multiple nodes.
Both IPv6 anycast and unicast nodes require configuration, but the nature of the configuration differs between the two. Anycast nodes need explicit configuration to recognize the anycast address, while unicast nodes also require configuration, such as unique IPv6 addresses and network parameters.
I think B is not that correct.
To implement anycast in a network, we need to do some special configuration on the router, so that the router recognize the address as an anycast address. But we don't have to do this on end devices, which are "IPv6 anycast nodes" referred in the option B.
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/xe-16-5/ip6b-xe-16-5-book/ip6-anycast-add-xe.pdf
Option 'A' is correct, and 'B' is not.
It is how one interprets "special configuration".
It would appear that this implies configuring an IPv6 address on the interface.
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