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Cisco Certified Network Associate (CCNA) · Cisco
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B. Unique local is similar to IPv4's private addresses. You can't even ping an IPv6 link local, so I wouldn't say C.
B Unique Local Addresses (ULAs) are designed for use within a single organization or site. They are not globally routable and are intended to be unique within a confined network or domain. ULAs provide internal addressing for devices within an organization's network without the need for public Internet routing.
for me B and C could be correct because Assigning either a ULA or a LLA to the device ensures that its IPv6 address is reachable only within the internal network and cannot be accessed from the public Internet. Depending on the specific requirements and network setup, the engineer can choose between these two types of addresses.