What command allows configuration of the duplex setting on multiple interfaces of an EX Series switch simultaneously?

The command that allows configuration of the duplex setting on multiple interfaces of an EX Series switch simultaneously is the interface-range command. This command is particularly useful for network administrators who need to apply the same configuration changes across numerous interfaces without having to enter each interface configuration mode individually.

When using the interface-range command, you can specify a range of interfaces in a single command line. This capability significantly streamlines the configuration process and reduces the likelihood of errors that may occur if changes were made to each interface separately. For example, if you wanted to change the duplex setting for a range of Ethernet ports, you could do so in a single session using the interface-range command, which enhances efficiency and management.

The other options, while they may sound similar, do not provide the same functionality in terms of configuring multiple interfaces at once for specific settings such as duplex. Therefore, the interface-range command stands out as the correct choice for this scenario, aiding in effective network management.