If loopback 10.54.73.1/32 is represented as IPv6 0:0:0:0:0:ffff:a36:4901, which IPv6 prefix length should be used?
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Correct answer: /128.
Why this is the answer
The correct IPv6 prefix length is /128. This is because the IPv6 address 0:0:0:0:0:ffff:a36:4901 is a full 128-bit address, representing a single host. The IPv4 address 10.54.73.1 is embedded within the last 32 bits of this IPv6 address (a36:4901 converts to 10.54.73.1 in hexadecimal). A /128 prefix length indicates a unique host address, similar to a /32 in IPv4 for a loopback interface. Incorrect options: /64 is a common prefix length for IPv6 subnets, indicating a network portion and a host portion, but not a single host. /96 is sometimes used for specific transition mechanisms but doesn't represent a single host in this context. /124 would allow for 16 host addresses, not a single one.
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