What does a node in the MIB Tree refer to?
A node in the Mib tree refers to an Object to be managed by the agent. Each object, whether it’s a device or a characteristic of a device, must have a name by which it can be uniquely identified. That name is the object identifier. It is written as a sequence of integers, separated by periods. For example, the sequence 1.3.6.1.2.1.1.1.0 specifies the system description within the system group, of the mgmt sub-tree.