Which channel-group mode must be configured when bundling multiple distribution interfaces connected to a WLC?
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Correct answer: Channel-group mode on..
Why this is the answer
When bundling multiple distribution interfaces connected to a Wireless LAN Controller (WLC), the channel-group mode must be set to "on." This is because the WLC does not participate in LACP (Link Aggregation Control Protocol) or PAgP (Port Aggregation Protocol). The "on" mode forces the interface into an EtherChannel without negotiation, which is required for static EtherChannel configurations. "Passive" and "desirable" modes are used with PAgP, and "active" mode is used with LACP. Since the WLC does not support these negotiation protocols, these modes would prevent the EtherChannel from forming correctly.
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