The spanning-tree feature that places a port immediately into a forwarding state is called PortFast. PortFast is used primarily on access ports where end devices like computers are connected. It bypasses the usual listening and learning states of the spanning tree protocol, allowing the port to transition directly to the forwarding state, which reduces the time it takes for a device to start communicating on the network.

To disable Dynamic Trunking Protocol (DTP) on a switch port, you can change the administrative mode to access. This action prevents the port from attempting to negotiate a trunk link with the connected device, effectively disabling DTP on that port.

Cisco APIC-EM can verify ACLs. It offers a network-wide simplified approach to manage, deploy, and ensure network policy compliance, including ACL and path verification. Cisco Prime Infrastructure is geared more towards managing infrastructure and performance, especially in wireless environments, while Cisco Wireless LAN Controller is focused on wireless network management. Cisco IOS-XE is an operating system for Cisco devices, but it doesn't offer the same centralized verification functionality as APIC-EM.