Which feature allows the firewall to automatically identify and categorize IoT (Internet of Things) devices...

Comprehensive and Detailed 150 to 250 words of Explanation From Palo Alto Networks Network Security Analyst Knowledge:

While App-ID identifies the software, Device-ID is a newer Palo Alto Networks technology (often paired with the IoT Security subscription) that identifies the physical device type (e.g., a Siemens PLC, a Philips MRI machine, or an Amazon Echo).

Device-ID uses machine learning to analyze the traffic patterns, MAC addresses, and protocols unique to IoT devices. Once identified, the analyst can write security policies based on the "Device-ID" rather than IP addresses. For example, an analyst can create a rule that says "All Infusion Pumps are only allowed to talk to the Medical Management Server." This provides much higher granularity and security for IoT environments, where devices often have weak internal security and fixed, hard-to-manage identities.