Which two statements about unique local IPv6 addresses are true? (Choose two.)
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A. B. C. D. E.DE
IPv6 Unique Local Addresses (ULA) are used for local communication within a specific organization, similar to IPv4 private addresses. ULAs are not globally routable, meaning they cannot be used on the public Internet. Instead, they are used to communicate between devices within a local network or between multiple local networks.
The two true statements about Unique Local IPv6 Addresses are:
They use the prefix FC00::/7: The FC00::/7 prefix is reserved for Unique Local IPv6 Addresses. This prefix has been defined in RFC 4193, which also specifies how to generate a ULA. The prefix is comprised of a 7-bit prefix, which is always set to 1111 110, followed by a 40-bit random number, and a 16-bit subnet ID.
They are not routable on the IPv6 global internet: ULAs are not globally routable, which means they cannot be used on the public Internet. Instead, they are used to communicate between devices within a local network or between multiple local networks.
Option A, "They are defined by RFC 1884," is incorrect. RFC 1884 is the original IPv6 specification, but it does not cover ULAs. Option B, "They use the prefix FEC0::/10," is also incorrect. This prefix was once reserved for site-local addresses, but it has been deprecated, and should no longer be used.
Option C, "They can be routed on the IPv6 global internet," is also incorrect. As mentioned earlier, ULAs are not globally routable, which means they cannot be used on the public Internet. Finally, option D, "They are identical to IPv4 private addresses," is incorrect. Although ULAs serve a similar purpose to IPv4 private addresses, they have a different prefix and structure.