Single supplicant—Authenticates only the first end device. All other end devices that connect later to the port are allowed full access without any further authentication. They effectively piggyback on the first end device’s authentication. single-secure supplicant—Allows only one end device to connect to the port. No other end device is allowed to connect until the first device logs out. multiple supplicant—Allows multiple end devices to connect to the port. Each end device is authenticated individually.