The '[...]' field of the show ip interface brief command shows the Layer 2 status of the interface.

The '[...]' field that reflects the Layer 2 status of the interface in the output of the "show ip interface brief" command is the Protocol field. This field indicates whether Layer 2 protocols, such as Ethernet, are operational on that interface. If the Protocol status shows "up," it means that the link is functioning correctly and that Layer 2 connectivity is established. Conversely, if it shows "down," it signifies an issue at Layer 2, which may involve cabling problems, issues with the physical interface, or improper configuration.

The other fields in the output provide different types of information. For instance, the Status field indicates the Layer 1 physical status, Admin denotes the administrative state of the interface, and Connection is not a standard field in this context within the command output. Thus, understanding the distinction between these fields helps in diagnosing network connectivity issues effectively.