The two correct statements about IPv6 prefixes are:
-
FF00::/8 is used for IPv6 multicast. - This is true, as the FF00::/8 prefix is designated for multicast addresses in IPv6.
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FE80::/10 is used for link-local unicast. - This is also true, correct prefix for link-local addresses in IPv6 ranges from FE80:: to FEBF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF.
The other two statements are not correct:
-
FEC0::/10 is used for IPv6 broadcast. - This is false because IPv6 does not use broadcast addressing; it uses multicast and other means for similar functionality.
-
FE80::/8 is used for link-local unicast. - This is false because the correct prefix for link-local addresses is FE80::/10.
So the true statements are the first and the fourth: FF00::/8 is used for IPv6 multicast and FE80::/10 is used for link-local unicast.