Which mode must be used to configure an EtherChannel between two switches without using a negotiation protocol?
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Correct answer: on.
Why this is the answer
The 'on' mode forces the interface into an EtherChannel without using a negotiation protocol like LACP or PAgP. Both ends of the EtherChannel must be configured with 'on' mode for the bundle to form. 'active' and 'desirable' are modes used with LACP and PAgP, respectively, which are negotiation protocols. 'active' actively sends LACP packets, and 'desirable' actively sends PAgP packets. 'auto' is a passive mode for PAgP, meaning it will only form an EtherChannel if the remote end is in 'desirable' mode.
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