200-301 · Question #784
Which three statements about IPv6 prefixes are true? (Choose three.)
The correct answer is A. FF00:/8 is used for IPv6 multicast. B. FE80::/10 is used for link-local unicast. C. FC00::/7 is used in private networks.. IPv6 uses specific address prefixes to classify addresses for different purposes, such as multicast (FF00::/8), link-local unicast (FE80::/10), and unique local unicast (FC00::/7) for private networks.
Question
Options
- AFF00:/8 is used for IPv6 multicast.
- BFE80::/10 is used for link-local unicast.
- CFC00::/7 is used in private networks.
- D2001::1/127 is used for loopback addresses.
- EFE80::/8 is used for link-local unicast.
- FFEC0::/10 is used for IPv6 broadcast.
How the community answered
(54 responses)- A93% (50)
- D2% (1)
- E2% (1)
- F4% (2)
Why each option
IPv6 uses specific address prefixes to classify addresses for different purposes, such as multicast (FF00::/8), link-local unicast (FE80::/10), and unique local unicast (FC00::/7) for private networks.
The FF00::/8 prefix is reserved for IPv6 multicast addresses, enabling efficient one-to-many communication.
The FE80::/10 prefix designates link-local unicast addresses, which are used for communication only on the local network segment and are not routable.
The FC00::/7 prefix is allocated for Unique Local Unicast (ULA) addresses, which are intended for private network use and are not routable on the global internet, similar to RFC 1918 addresses in IPv4.
The IPv6 loopback address is ::1/128, not 2001::1/127, which is a global unicast address typically used for point-to-point links.
While FE80:: is part of link-local unicast, the correct prefix length for link-local addresses is /10 (FE80::/10), not /8.
IPv6 does not use broadcast addresses; multicast (FF00::/8) serves the function of one-to-many communication, and FEC0::/10 was previously for site-local addresses but has been deprecated.
Concept tested: IPv6 address prefixes and types
Source: https://www.rfc-editor.org/rfc/rfc4291
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