Final answer:
The statement is false; IPv6 commonly uses /48, /56, or /64 prefixes, and /24 is typically an IPv4 prefix, not IPv6.
Step-by-step explanation:
The statement that an ISP that supports IPv6 can allocate a /24 or /48 routing Prefix is false. In the context of IPv6, the commonly allocated prefixes for end sites (such as individual organizations) are /48, /56, or /64. A /24 prefix allocation is not standard in IPv6 and is typically associated with IPv4 addressing. ISPs usually assign larger prefixes in the IPv6 addressing scheme, which allows for a much larger address space compared to IPv4.