Which two of the following are LACP EtherChannel modes? (Choose two.)
- on
- passive
- desirable
- off
- active
- auto
Explanation: The Link Aggregation Control Protocol (LACP) is an IEEE standard (802.3ad) that facilitates the automatic bundling of physical ports into a single logical EtherChannel. LACP operates using two specific modes: active and passive. In active mode, the switch port unconditionally initiates negotiations by sending LACP packets to the connected peer. In passive mode, the port does not initiate negotiation but instead waits for LACP requests and responds to them if a compatible device is detected.
In contrast, other modes mentioned belong to different mechanisms:
- desirable and auto are the operational modes for PAgP (Port Aggregation Protocol), which is a Cisco proprietary protocol.
- The on mode is used for static manual configuration, where the EtherChannel is forced to form without the use of any negotiation protocol like LACP or PAgP.
Related exam: Modules 1 – 7: Checkpoint Exam: Network Switching Answers (CCNP ENCOR v9)
