What specific command parameter is utilized to display the switch chassis serial number?

The command that successfully displays the switch chassis serial number is indeed "show idprom backplane." When executed, this command retrieves information stored in the identifier PROM (IDPROM) specifically for the backplane of the switch. This identifier contains various details about the hardware, including the serial number.

The "backplane" refers to the main circuit board that connects all the components of the switch, which houses the serial number that uniquely identifies the hardware. By specifying "backplane," you effectively direct the command to extract relevant information tied to that specific part of the switch.

Utilizing this command is practical during tasks such as hardware inventory management, troubleshooting, or verifying warranty status, where the serial number is crucial for identifying the unit in question.

The other command options don’t focus on the correct hardware component or use an incorrect approach to gather the serial number. Each of them retrieves different kinds of information or data that are not specifically oriented towards the chassis serial number, making "show idprom backplane" the most appropriate choice for this task.