Exam 200-301 topic 1 question 851 discussion

LAG requires the EtherChannel to be configured for 'mode on' on both the controller and the Catalyst switch.

https://www.firewall.cx/cisco/cisco-wireless/how-to-configure-wlc-lag-and-port-channel-with-nexus-catalyst-switches.html#:~:text=Link%20Aggregation%20Control%20Protocol%20(LACP)%20or%20Cisco%20proprietary%20Port%20Aggregation%20Protocol%20(PAgP)%20are%20not%20supported%20by%20the%20WLC.%20Port%2DChannel%20members%20must%20be%20set%20unconditionally%20to%20LAG https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/m_configuring_link_aggregation.html#:~:text=The%20controller%E2%80%99s%20neighbor,configured%20as%20follows%3A

A is the correct Answer. I found "LAG requires the EtherChannel to be configured for 'mode on' on both the controller and the Catalyst switch." Source: https://community.cisco.com/t5/wireless-mobility-knowledge-base/lag-link-aggregation/ta-p/3128669

A is correct

thought active was good

Be aware that even though the LAG acts as a traditional EtherChannel, Cisco WLCs do not support any link aggregation negotiation protocol, like LACP or PaGP, at all. Therefore, you must configure the switch ports as an unconditional or always-on EtherChannel.

Answer is C

'mode on' is required

C. active When configuring Link Aggregation Groups (LAG) on a Wireless LAN Controller (WLC), the "active" mode should be used for the EtherChannel. This mode is also known as "LACP active mode" (Link Aggregation Control Protocol active mode). LACP is a protocol used to dynamically negotiate and manage the creation of Link Aggregation Groups. In an active LACP configuration, the WLC actively initiates the negotiation process and forms an EtherChannel with the connected switch. This helps ensure that the configuration is consistent on both ends of the link. Options A, B, and D are not the recommended modes for configuring LAG with LACP on a WLC.