The access privileges which govern what
management operations a particular target party
may perform when requested by a particular subject
party. These privileges are specified as a sum of
values, where each value specifies a SNMP PDU type
by which the subject party may request a permitted
operation. The value for a particular PDU type is
computed as 2 raised to the value of the ASN.1
context-specific tag for the appropriate SNMP PDU
type. The values (for the tags defined in RFC
1157) are defined in RFC 1351 as:
Get : 1
GetNext : 2
GetResponse : 4
Set : 8
Trap : 16
The null set is represented by the value zero.