Oracle SQLPlus commands

How to get Oracle Version:
select * from v$version where banner like 'Oracle%'

Change Oracle Database User Password:
ALTER USER user_name IDENTIFIED BY new_password;

Networking, Windows

NETWORK CONFIGURATION BACKUP:
Save network configuration: netsh dump > lan.cfg
Restore network configuration: netsh exec lan.cfg

TROUBLESHOOTING DNS:
IPCONFIG /FLUSHDNS
IPCONFIG /RELEASE
IPCONFIG /RENEW