200-301 · Question #995
Which IPv6 address range is suitable for anycast addresses for distributed services such DHCP or DNS?
The correct answer is A. FF00:1/12. The FF00::/12 IPv6 address range includes well-known multicast addresses used by distributed services like DHCPv6 and mDNS, providing anycast-like functionality.
Question
Options
- AFF00:1/12
- B2001:db8:0234:ca3e::1/128
- C2002:db84:3f37:ca98:be05:8/64
- DFE80::1/10
How the community answered
(30 responses)- A87% (26)
- B3% (1)
- C3% (1)
- D7% (2)
Why each option
The FF00::/12 IPv6 address range includes well-known multicast addresses used by distributed services like DHCPv6 and mDNS, providing anycast-like functionality.
The FF00::/12 range encompasses various well-known multicast addresses used for service discovery, such as those for DHCPv6 agents (FF02::1:2) and mDNS (FF02::FB), where a client receives a response from the closest or first available server, providing anycast-like functionality for distributed services.
This is a specific global unicast address from the documentation prefix, not a general address range suitable for anycast for distributed services.
This is a specific global unicast address, and the /64 prefix itself is not designated for general anycast services, especially as the 2002::/16 prefix was historically for 6to4 transitions.
FE80::/10 is the link-local unicast address range, which is not designed for global or site-wide distributed service anycast functionality.
Concept tested: IPv6 anycast and multicast for service discovery
Source: https://datatracker.ietf.org/doc/html/rfc3315#section-2.1
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