CCNA: Cisco Certified Network Associate — Question 1054

What is a difference between an IPv6 multicast address and an IPv6 anycast address?

Answer options

• A. An IPv6 multicast address uses the prefix 2002::/15 and forwards to one destination, and an IPv6 anycast address uses the prefix ff00:/8 and forwards to any destination in a group.
• B. A packet sent to an IPv6 multicast address is delivered to one or more destinations at once, but a packet sent to an IPv6 anycast address is routed to the closest interface with that address.
• C. IPV6 multicast addresses are used to transition from IPv4 to IPv6, and IPv6 anycast addresses are used for address aggregation in an IPv6-only environment.
• D. An IPV6 multicast address is assigned to numerous interfaces within a subnet, but an IPv6 anycast address is used for a predefined group of nodes in an all-IPv6 routers group.

Correct answer: B

Explanation

The correct answer, B, accurately describes how IPv6 multicast addresses deliver packets to multiple destinations simultaneously, while IPv6 anycast addresses direct packets to the nearest interface with that address. Option A incorrectly states the prefixes and functionalities, C misrepresents the purposes of the address types, and D does not correctly define the scope of multicast and anycast addresses.