A configuration file for the client or server that specifies:
Client domain to append to unqualified service names or net service names
Order of naming methods the client should use when resolving a name
Route of connections
Preferred Oracle Names servers
External naming parameters
Oracle Advanced Security parameters
The sqlnet.ora file must reside in one of the following locations:
The directory specified by the TNS_ADMIN environment variable If the TNS_ADMIN environment variable is not defined as a variable on Windows NT, it may be in the registry.
The $ORACLE_HOME/network/admin directory on UNIX or the ORACLE_HOME \network\admin directory on Windows operating systems.
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