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

The 'Status' field of the show ip interface brief command reflects the Layer 1 status of the interface. Layer 1, which is the Physical layer of the OSI model, concerns the physical connectivity of the interface. This includes whether the interface is up or down based on whether the physical connection is active, signaling properly, and whether the device is receiving power.

In practice, if the Layer 1 status is “up,” it indicates that the interface is connected to a cable and is receiving a signal, while a “down” status indicates there may be a physical issue with the connection, such as a disconnected cable, faulty hardware, or other issues affecting physical connectivity.

The other layers mentioned, such as Layer 2 (the Data Link layer), Layer 3 (the Network layer), and Layer 4 (the Transport layer), deal with different aspects of network communication and do not directly relate to the physical status as shown in the 'Status' field of the command. Hence, the answer correctly identifies that the 'Status' field pertains to Layer 1.