Level of security required for SNMP get or SET.
noSec: no security; all the PDU with a known user id
are accepted
authSet: authentication required for set; all GET
are accepted, but not authenticated SET are
rejected.
authAll: authentication required for SET and GET; not
authenticated SET and GET are rejected.
privSet: authentication required for GET and encryption
required for SET.
privAll: encryption required for SET and GET.
trapOnly: no SNMP GET or SET are accepted.