It's a security person's worst nightmare. You've just inherited a large, diverse enterprise with relatively few security controls when something happens. We all try to detect malicious activity at the perimeter of the network by monitoring our intrusion detection systems, and watching attackers bang futilely on our firewall. Even those attackers tricky enough to slip through the firewall bounce harmlessly off our highly secured servers, and trip alarms off throughout the network as they attempt to compromise it. Reality is usually somewhat different: most of us simply don't have the tools, or at least we don't have expensive, dedicated tools. But we do have ways to stop the pain.
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