Exam 200-301 topic 1 question 235 discussion

D is correct "When you enable LAG, only one functional physical port is needed for the controller to pass client traffic." https://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_010100001.html#:~:text=When%20you%20enable%20LAG%2C%20only,controller%20to%20pass%20client%20traffic.&text=When%20you%20enable%20LAG%2C%20you,on%20which%20it%20received%20them.

This question could be phrased better.

One functional port is needed, with however many non-functional ports 0 to x

Guys, LAG is all about combining two or more physical link and using as etherchannel. There is no way that option D is correct. If there is only one physical channel how it will create etherchannel ?

You can set single-port LAG

D is correct

D is correct Link aggregation (LAG) is a partial implementation of the 802.3ad port aggregation standard. It bundles all of the controller’s distribution system ports into a single 802.3ad port channel, thereby reducing the number of IP addresses needed to configure the ports on your controller. When LAG is enabled, the system dynamically manages port redundancy and load balances access points transparently to the user. LAG simplifies controller configuration because you no longer need to configure primary and secondary ports for each interface. If any of the controller ports fail, traffic is automatically migrated to one of the other ports. As long as at least one controller port is functioning, the system continues to operate, access points remain connected to the network, and wireless clients continue to send and receive data.