Pros of Intrusion Detection Systems
Fence Detection
Visibility. An IDS provides a clear view of what's going on within your network. It is a valuable source of information about suspicious or malicious network traffic. There are few practical alternatives to an IDS that allow you to track network traffic in depth.
Defense. An IDS adds a layer of defense to your security profile, providing a useful backstop to some of your other security measures.
Response capabilities. Although they probably will be of limited use, you may want to enable some of the response features of the IDS. For instance, they can be configured to terminate a user session that violates policy. Obviously, you must consider the risks of taking this step, since you may accidentally terminate a valid user session. However, in certain cases it can be an important tool to prevent damage to the network.
Tracking of virus propagation. When a virus first hits your network, an IDS can tell you which machines it compromised, as well as how it is propagating through the network to infect other machines. This can be a great help in slowing or stopping a virus's progress and making sure you remove it.
Evidence. A properly configured IDS can produce data that can form the basis for a civil or criminal case against someone who misuses your network.
Source: HC Pro
Fence Detection.
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