DBACOCKPIT integration of Oracle db

Hello Oracle experts,

we are trying to integrate several customer SAP systems on Oracle 12 /Windows into DBACOCKPIT of our central SAP system.

Because these systems reside in other networks we prefer to adapt the SQLNET.AUTHENTICATION_SERVICES parameter.

Question:

What is the difference between a) und b) for our purpose?

a) SQLNET.AUTHENTICATION_SERVICES = NONE

b) SQLNET.AUTHENTICATION_SERVICES = ALL

Is it possible with variant b) to establish the DBACOCKIT connect through different domains?

Thank you!