Using the SNMP Query operation on a pattern for a custom device query, it is best practice to do what?

The following is displayed while discovering a new network device on a Discovery Status: "Active, couldn't classify". What could cause this error?
Response:

SNMP Credentials require which of the following?

In a network, a certain number of ports is required to be opened for WMI to discover a subnet of Windows Servers containing highly sensitive data. What would you do to reassure network administrator who is concerned about opening ports?
Response:

In order to use Debug from the Pattern Designer, you must have what?