How can I use a DDoS PCAP file to test the effectiveness of a DDoS mitigation device?

You can replay the PCAP file using tools like `tcpreplay` to simulate the DDoS attack against your mitigation device. Monitor the device's performance (e.g., packet loss, latency) and verify that it correctly identifies and mitigates the attack traffic. This allows you to evaluate the device's effectiveness in a controlled environment.