Which response strategy is important to implement immediately after identifying a compromised system?

The immediate response strategy upon identifying a compromised system is to isolate that system. This action is crucial because it helps contain the threat, preventing further damage or spread of the compromise to other systems on the network. By isolating the compromised system, security teams can prevent attackers from accessing sensitive data or moving laterally within the network, which is vital for maintaining overall security.

In contrast, notifying all employees is important but usually comes after immediate containment measures are taken; it helps ensure that everyone is aware of the situation but does not address the immediate threat. Conducting a financial analysis can be relevant for understanding the impact of the breach, but it is not an urgent action needed to stop the breach from escalating. Updating all software may help prevent future incidents, but it does not mitigate the current threat posed by an already compromised system. Therefore, isolating the compromised system stands out as the most critical and immediate step in an incident response strategy.