An IPv6 subnet ID is how many bits long? A. 128
B. 16
C. 64
D. 32
An IPv6 subnet ID is how many bits long?
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The correct answer is C. 64.
In IPv6, the subnet ID is part of the address that identifies a specific subnet within the larger address space. The full IPv6 address is 128 bits long, and typically, the first 64 bits are used for the network prefix (which includes the subnet ID) and the remaining 64 bits can be used for the interface ID. This means the subnet ID itself is generally 64 bits long.