Connecting your server to a network gives it access—and makes it vulnerable—to everyone on the network. The larger the network, the larger the threat. When you connect your system to a network, you should assess the security threat that the network connection creates. To make this assessment, you need to consider the potential harm to your organization from a successful security attack.
The impact of a security attack depends on what system and what information are compromised. The loss of a key server affects many users, whereas the loss of a desktop client may affect only one user. Likewise, unauthorized access to a file containing plans for the office party cannot be compared to unauthorized access to your corporate strategic plan. Although your efforts should be directed toward protecting things that are important, every system requires some level of protection. A break-in on a small, insignificant system can end up compromising your entire network.
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