Which are two of the tasks that must be performed to en…

Which are two of the tasks that must be performed to enable SQL*NET access for your DBaaS database instance over SSL?

A.
You must open a port on the virtual machine (VM) that is hosting the instance.

B.
You use Net Manager (NETMGR) to configure a database alias and set the connect string.

C.
You use Oracle Connection Manager to configure the required network settings.

D.
You must configure SSL support on the instance.

Explanation:
SQL*Net is Oracle’s remote data access protocol that enables client-server and server-server communications across networks.
An Oracle client connects to the server using the port address of the listener, which is normally defined as TCP port 1521 during Oracle installation.
Oracle Net Manager is a utility used for configuring SQL*Net.

http://www.orafaq.com/wiki/Net_Manager