As well as user credentials, the Listener needs a connect string that is used to determine how to get to a database. Oracle offers several different types of connect string for database lookup. All of these methods can be used with an Oracle Wallet:
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tnsnames.ora entries: This is the most common approach and with an Oracle Wallet defined, and we can just call sqlplus /@servicename. For example: sqlplus /@PAOLO
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LDAP: details of this method are not defined here, but can be used with the Oracle Wallet.
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EZConnect: this is the easiest method and does not require a tnsnames.ora entry.