Quick Answer

The correct order for LACP EtherChannel negotiation and bundle formation steps is: system priority exchange, port priority exchange, operational key negotiation, parameter synchronization, and finally the port channel interface coming up to forward traffic. This sequence follows the IEEE 802.3ad LACP state machine, where the system with the lower priority becomes the active side and dictates which ports bundle based on their port priorities, then both sides negotiate a consistent operational key to ensure compatibility, synchronize parameters like speed and duplex, and only then does the logical port channel become operational. On the ENCOR 350-401 exam, this drag-and-drop question tests your understanding of the LACP finite state machine rather than just memorizing commands; a common trap is confusing port priority with system priority or placing parameter synchronization before key negotiation. A useful memory tip is to think of it as a handshake: first decide who leads (system priority), then choose the team (port priority), agree on the playbook (operational key), confirm everyone is ready (synchronization), and finally start the game (interface up).