Answer: D,E,F
Explanation:
https://docs.oracle.com/en/database/oracle/oracle-database/19/netag/introducing-oracle-net-services.html#GUID-6B1F0584-887D-4D2A-B982-40ACF15DF985
• Oracle Enterprise Manager Cloud Control combines configuration functionality across multiple file systems, along with listener administrative control to provide an integrated environment for configuring and managing Oracle Net Services.
• Oracle Net Manager provides configuration functionality for an Oracle home on a local client or server host.
A - false; netca can be run independently on the Oracle Installer
B - false; Oracle Net Manager can be used to configure listeners on the local server or server host
C - false; there need not exist the listener.ora file before lsnrctl utility is started
D - true; see answer B
E - true; EM Cloud Control: All the systems and services including enterprise application systems, databases, hosts, middleware application servers, listeners, and so on, are easily managed from one central location.
F - true; see answer E
Source:
B - Oracle database documentation: "Oracle Net Manager supports configuration of connect descriptors in a local tnsnames.ora file or directory server."
E - Oracle Enterprise Manager Cloud Control 13.5 documentation
Oracle Net Configuration Assistant is a post installation tool so i think that A is Wrong
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