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Network protection is vital to organizations big and small, but it doesn't have to be an expensive proposition. Learn how to protect your network with open-source tools, and do it completely free. Jungwoo Ryoo shows how to set up firewalls, investigate network traffic with a packet analyzer, detect threats and malicious activity with an intrusion-detection system, and enable network logging and monitoring. Start here for a low-cost route to a more secure network.