A network engineer uses the following Python script with Netmiko to send a command to a Cisco IOS-XE device:

```python

from netmiko import ConnectHandler

device = { 'device_type': 'cisco_ios', 'ip': '10.1.1.1', 'username': 'admin', 'password': 'password', 'secret': 'enable_secret'

}

connection = ConnectHandler(**device) output = connection.send_command('show ip interface brief')

print(output)

connection.disconnect() ```

What is the purpose of the 'secret' parameter in the device dictionary?