The dangers of systematic industrial or government espionage are also real threats in this Information Age. Unauthorized access, disclosure of information and denial of service are all common threats to networks. Many sites feel their information isn't classified or sensitive in any way. Therefore, they place little or no importance on securing their networks. Such networks are often targeted and considered safe havens for hacker activity.
Networks are inherently open by nature.
They wouldn't be of much help to a multitude of users if they were not allowed to share files and crucial services such as printing. Network and system administrators play a vital part in controlling this access. Through careful system configuration and well thought out plans, an administrator can make significant strides in securing the data stored on their systems. A significant percentage of network vulnerabilities result from the presence of bugs, holes and configuration weaknesses on systems attached to an organization s network. NFS permits workstation users to read and change the contents of files stored on the server without ever having to log into the server or supply a password.