Sql connection problem

Hai All
I am connecting via sqlplus in my database server. I already give the 'admin' password for 'sys' user at installation time. I connect in sql plus in different types.
SQL> conn / as sysdba
Connected.
I think this connection succeed because of operating system auhentication
SQL> conn sys/asdas as sysdba
Connected.
I give the wrong password here but it connected
I think this connection succeed because of operating system auhentication
SQL> conn sys/admin@db as sysdba
Connected.
This connection is ok
SQL> conn sys/asdas@db as sysdba
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
I give the wrong password and exact connection string(db) here but it not connected
why it not connected?
Please clarify...

As mentioned earlier as well
SQL> conn / as sysdba
Connected.
I think this connection succeed because of operating system auhenticationYES this is OS authentication.
SQL> conn sys/asdas as sysdba
Connected.
I give the wrong password here but it connected
I think this connection succeed because of operating system auhenticationYES this is OS authentication.
SQL> conn sys/admin@db as sysdba
Connected.
This connection is okThis is the remote connection goes through the listener and you got connected bec's you have given a corect userid, password & conncection string.
SQL> conn sys/asdas@db as sysdba
ERROR:
ORA-01017: invalid username/password; logon denied
Warning: You are no longer connected to ORACLE.
This is again a remote connection goes through the listener and you not getting connected bec's you have given a correct userid, WRONG password & correct conncection string.

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