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GIAC Response and Industrial Defense (GRID) Sample Questions:

1. Your ICS environment's monitoring system has detected an unusual spike in traffic between an engineering workstation and a control server.
How should you proceed with investigating this anomaly?

A) Reboot the control server immediately
B) Replace the workstation to prevent future issues
C) Ignore the anomaly as it may be a false positive
D) Analyze the logs from both the workstation and control server to understand the nature of the traffic and isolate the systems if necessary

2. What is the key function of log correlation in ICS monitoring?

A) To reduce the number of devices on the network
B) To combine logs from different sources and identify patterns or anomalies
C) To monitor employee behavior
D) To improve system speed

3. Your security team has received a high-priority alert from a network intrusion detection system (NIDS) monitoring an ICS environment. The alert indicates unusual outbound communication from an ICS device to an external IP address.
What steps should you take to investigate and mitigate this potential security threat?

A) Immediately shut down all ICS devices
B) Ignore the alert, as it may be a false positive
C) Investigate the outbound communication by reviewing the logs, isolate the affected device from the network, and escalate the issue to the incident response team
D) Increase the network bandwidth to handle more traffic

4. Which of the following tools is commonly used to analyze network traffic for anomalies in an ICS environment?

A) Wireshark
B) Microsoft Word
C) Adobe Photoshop
D) Microsoft Excel

5. Your ICS network is being targeted by a sophisticated attacker who is attempting to disrupt operations by exploiting a known vulnerability in one of your devices.
What steps should you take using active defense principles to mitigate the attack and secure your environment?

A) Shut down the entire ICS network
B) Review the intrusion detection system (IDS) logs, block traffic from the attacker's IP address, apply the necessary patches to fix the vulnerability, and increase monitoring on the affected device
C) Continue normal operations without making any changes
D) Replace all hardware in the ICS network

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