Security is a must when dealing with a data network, this is why you have to take the proper precautions of coming up with a system to protect a business from any intruders, hackers, or anything of that nature. For most businesses you need a strong firewall and proxy to keep unwanted people out. You will also need a strong Anti-virus software and Internet Security Software. For authentication, you must use strong passwords and change it on a bi-weekly/monthly basis. When using a wireless connection, you must have a robust password. You also must raise awareness about physical security to employees. Finally, you must implement an optional network analyzer or network monitor.