Topic: 200-301 topic 1 question 172

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.

Re: 200-301 topic 1 question 172

Aren't both A and B correct?

  • areth
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Re: 200-301 topic 1 question 172

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.

Re: 200-301 topic 1 question 172

it´s A

Re: 200-301 topic 1 question 172

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

Re: 200-301 topic 1 question 172

It says in ur own link that "Anycast addresses can be used only by a device, not a host"

Re: 200-301 topic 1 question 172

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.

Re: 200-301 topic 1 question 172

A makes most sense

  • mda2h
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Re: 200-301 topic 1 question 172

Any one can explain why A is better than B?

Re: 200-301 topic 1 question 172

Why B is not correct ?

Re: 200-301 topic 1 question 172

A is correct.

Re: 200-301 topic 1 question 172

A and B are correct. What's wrong with B?