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Instance Specification - Tables And Lists

If the information is a column in a table (or list) of related information, a suffix is added which uniquely identifies the desired instance.
For example, in the { interfaces } group, the first data type is a scalar, thus: 
ifNumber ::= { interfaces 1 }
This is the number of interfaces a device has, regardless of their status. The MIB then defines: 
ifTable ::= SEQUENCE OF ifEntry
and 
ifEntry ::= SEQUENCE {
    ifIndex ::= INTEGER,
    ...
    ifOperStatus::= INTEGER,
    ...etc }
As an example, to retrieve information about (for example) the operational status of interface number 3, where multiple interfaces are in use, we could use: 
get (interfaces.ifTable.ifEntry.ifOperStatus.3)

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