The node ID is used to identify each device in the chassis cluster, and the cluster ID is used to distinguish between different chassis clusters in a network. This makes options B and D correct. Option A is incorrect because the node ID value typically ranges from 0 to a much lower value than 255, often 0 or 1 in most implementations. Option C is incorrect because changes to the cluster ID typically do not require a system reboot; a restart of certain services may suffice.