What is a true statement regarding Security Group Tags (SGTs)?

Security Group Tags (SGTs) play a crucial role in network security, particularly in the context of Cisco Identity Services Engine (ISE). The explanation for the selected answer revolves around the function and structure of SGTs in network environments.

An SGT is indeed a 16-bit value that is assigned by Cisco ISE to user sessions. This tagging system is designed to facilitate identity-based network access and policy enforcement. By using these tags, the network can classify and control traffic based on the identity of the user or device, rather than just their IP address or VLAN. This allows for more granular and dynamic security policies, enhancing the overall security posture of the network.

The other choices do not accurately describe SGTs. For instance, SGTs are not used for encryption; they serve more for identification and access control. Additionally, SGTs are very much associated with user sessions as they get assigned when a session is established; this is key in applying security policies relevant to the user's identity. Lastly, while SGTs do help with device identification, their primary function extends beyond that by influencing policy decisions and managing access controls based on dynamic identity information.