[oracle@test admin]$ pwd
/u01/app/oracle/product/11.2.0/db_1/network/admin

[oracle@test admin]$ cat listener.ora
# listener.ora Network Configuration File: /oracle/app/oracle/product/11.2.0/dbhome_1/network/admin/listener.ora
# Generated by Oracle configuration tools.


LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.0.10)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)


ADR_BASE_LISTENER = /oracle/app/oracle
[oracle@test admin]$ cat tnsnames.ora
test =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.0.0.10)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = test)
)
)