Which two statements are true about listeners?
Listeners use only the TCP/IP protocol.
Multiple listener processes can run simultaneously on a host.
Multiple database instances can be registered with a single listener,
Listener-related errors can be traced only at the administrative level.
Only one database instance can be registered with a single listener at any time.
http://docs.oracle.com/cd/E11882_01/network.112/e10835/protocoladd.htm#NETRF179
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