Oracle client does not need to configure the Tnsnames.ora file to directly connect to the server database

During previous Oracle use, when the client was connected to the server, the Tnsnames.ora file in the client was configured as follows:

= =    = = = = 192.168         . 1.150 = 1521         )))) ())))      

But today I accidentally learned from colleagues that a way to directly access a database without configuring this content is to use the following command when Sqlplus a connection:

C:\Users\Administrator>Sqlplus/Nologsql*Plus:release11.2.0.1.0Production onFriday JulyTen  the: the: +  -Copyright (c)1982, ., Oracle. Allrights reserved. SQL>Conn User Name/Password@ server Address: Port/Service_Name is connected. SQL> 

This allows you to connect directly to the server, using the PL/SQL developer connection directly to the " server address: Port /service_name" to the database text box can be

Oracle client does not need to configure the Tnsnames.ora file to directly connect to the server database