Section: General Networking Knowledge

The show cellular unit network command in Cisco IOS is used to view detailed information about the cellular modem and the network it's connected to. Here's the type of information this command usually displays:
Network Status: Whether the device is registered on the cellular network.
Carrier Information: The name of the cellular network provider.
Technology: The cellular technology in use (e.g., 3G, 4G/LTE).
Signal Strength: Signal strength indicators like RSSI and RSCP.
Cell Site Information: Data about the cell tower or base station the device is connected to.
IP Address: The IP address assigned to the cellular interface.
Why other options are less likely:
show cellular unit radio: Provides information about the radio module itself, such as its state and power levels.
show cellular unit hardware: Focuses on hardware-level information of the cellular unit.
show cellular unit profile: Displays configuration details of the cellular profile used to connect to the network.
Reference:
Cisco command documentation for different show cellular options: https://www.cisco.com/c/en/us/td/docs/routers/wireless-wan/Cisco-Catalyst-Cellular-Gateways/cisco-cellular-gateways-command-reference-guide/m-show_commands.pdf

* A. SSH...secure remote access: This is correct. SSH (Secure Shell) is designed specifically for secure remote access. It utilizes strong encryption to protect data transmissions, including login credentials and commands.
* B. Telnet...secure remote access: This is incorrect. Telnet is inherently insecure as it transmits all data, including sensitive passwords, in cleartext.
* C. SSH uses...TCP port 23: This is incorrect. SSH uses TCP port 22 by default, while Telnet uses TCP port 23.
* D. Telnet preferred...security reasons: This is incorrect. SSH is vastly preferred over Telnet due to its strong security features.
* E. Telnet connection...router reboots: This is correct. Telnet connections are not persistent, so a router reboot disrupts them. This re-enforces their lack of suitability for critical management tasks.
Key Points:
* Security: SSH is the recommended protocol for remote access to network devices due to its strong encryption and authentication mechanisms.
* Persistence: Telnet connections are temporary and get disrupted on events like router reboots.