Which command configures a trunk port on Cisco devices?

The command that configures a trunk port on Cisco devices is "switchport mode trunk." This command is part of the interface configuration mode and is specifically designed to define the behavior of a certain port on a switch as a trunk. A trunk port is used to carry traffic for multiple VLANs, allowing VLAN tags to be added to the frames by enabling communication between different VLANs across the same link.

By using "switchport mode trunk," the administrator sets the designated port to send and receive traffic for all VLANs across a Trunk link, utilizing protocols such as IEEE 802.1Q for VLAN tagging. This is essential for enabling inter-VLAN communication in a network setup that utilizes VLANs for segmentation and management of broadcast domains.

Commands like "set trunk-mode on," "enable trunk port," and "configure trunk settings" do not correspond to the standardized command syntax used to configure trunk ports on Cisco switches, making them ineffective for this purpose. Understanding the correct command not only ensures proper network configuration but also supports the desired functionality of the network infrastructure.