What does Sophos Firewall use to identify computers it has a Security Heartbeat with?

The correct answer highlights that Sophos Firewall utilizes the IP address as a method to identify computers it maintains a Security Heartbeat connection with. The Security Heartbeat feature allows for continuous monitoring of endpoint security status, and IP addresses play a crucial role in this process. Each device on a network is typically assigned a unique IP address, which helps the firewall recognize and communicate with it effectively. This ensures that the firewall can enforce policies based on the security posture of the endpoint.

While other identifiers, such as hostnames, device IDs, or user accounts, can also provide insights into device identification, they are not the primary means by which the Sophos Firewall establishes and manages the Security Heartbeat. The reliance on IP addresses allows for a straightforward way to track devices at the network level, especially in cases where devices may change their hostname or the user may change over time.