*Alter defualt user names and passwords for network devices.
*Alter default SSID for each access point device.
*Alter the default IP subnet.
*Stop SSID broadcast.
*Turn off DHCP.
*Enable Mac filtering.
*Adjust signal strength to bare minimum needed
*Disable or change Simple Network Management Protocol (SNMP) settings to prevent outsiders from obtaining personal information.
*Install firewalls for every computer.
Thanks in advance.