Final answer:
Administrators interact with Cisco b) IOS 15 using CLI, a text-based interface accessible through console port, Telnet, or SSH for configuring and troubleshooting network devices.
Step-by-step explanation:
Administrators typically interact with Cisco b) IOS 15 by using a CLI, connecting through the console port, Telnet, or SSH. This is because Cisco IOS (Internetwork Operating System) is the software platform that runs on most Cisco routers and switches and provides the features necessary to operate the network. Its command-line interface (CLI) is a text-based interface that allows administrators to enter various commands to configure and troubleshoot Cisco network devices.
Administrators use a direct physical connection to the console port when they need to configure devices from scratch or when network access is not available. For remote administration, Telnet can be used, but it is less secure as it sends data, including passwords, in plaintext. Secure Shell (SSH) is a more secure alternative for remote access since it encrypts the traffic. These access methods ensure that administrators can manage network devices from various locations, whether they are physically next to the device or accessing it over the network.